JEXL implements an Expression Language based on some extensions to the JSTL Expression Language supporting most of the constructs seen in shell-script or ECMAScript. Note : Two regular expressions are equivalent if languages generated. Fortunately, you don't need to use StringBuilder anymore - the compiler can handle it for you. , a formalism for generating elements of a formal language. Microsoft Flow in particular makes the design of a workflow easy with a rich design experience - except when it comes to expressions. Every processor has different functionality, which contributes to the creation of output flowfile. For large numbers, either use the join() method or StringIO - the official recommended way for efficiency. This question is complicated by two issues. Apache NiFi supports powerful and scalable directed graphs of data routing, transformation, and system mediation logic. share | improve this answer. permissions}. 1 Introduction. EvaluateJsonPath takes a JSON path expression like $. Concat is being used. Since for the marriage example the two sets are completely disjoint, the simile will work. It is useful for sending messages and keeping track of what is happening in the program. It is built from scratch for robustness with an extensive test suite. : to link together in a series or chain. You can already use the function by connecting to a dataset in Power BI service and creating report-level measures. Solved: I am trying to concatenate set of Text values with new line in between. The string functions in Hive are listed below: ASCII( string str ) The ASCII function converts the first character of the string into its numeric ascii value. About this Guide¶. And I manually add two properties for the header properties to add. The table shown below shows the operators in ST and IL with the available modifiers in IL. Each str can be a column name, or it can be a literal character string (meaning a sequence of characters enclosed by two single quotes), or just white space. Java Expression Language (JEXL) JEXL is a library intended to facilitate the implementation of dynamic and scripting features in applications and frameworks written in Java. When naming variables, note that Python is case sensitive, so yield is not the same as Yield. Working with Arrays in Standard SQL In BigQuery, an array is an ordered list consisting of zero or more values of the same data type. If the trimmed value is shorter than the length of the receiving variable, SAS pads the value with new blanks as it assigns it to the variable. Reverse (string s) Hive > select reverse (‘Mobile’) Returns the result of a reversed string. The result of such a concatenation is implementation-defined. It returns an array of information or null if no match are found. Signed-off-by: Koji Kawamura <ijoka. It discusses operators, expressions, literals, local variables, control-flow, and gives some general guidelines on various aspects of method implementation. A series of references to cases that establish legal precedents and to other authorities that appear one after another and are printed following a legal assertion or conclusion as supportive authority. split method. The forms that take a The forms that take a melExpression argument apply the regex to the result of its evaluation instead of message. The concatenation operator does not trim leading or trailing blanks. LEN () Returns the number of characters in a text string. Hi, I have a column of numbers and another one of strings, say A, B and C in A2:A4 and 1,2,3 in B2:B4. Most clients of regular expressions will use the facilities of package regexp (such as Compile and Match) instead of this package. After reviewing the past exam papers it seems like each chapter is well represented in the exam and so it would be best to have an understanding of all the outcomes. Fortunately, you don't need to use StringBuilder anymore - the compiler can handle it for you. VBScript is a scripting language of QTP/UFT. If the trimmed value is shorter than the length of the receiving variable, SAS pads the value with new blanks as it assigns it to the variable. In "Basic types", we learned about strings and used the is_binary/1 function for checks:. Returns a string consisting of the elements of the object repeated the given times. A string can be mutable or immutable. Or text to concatenate, if a single value is provided for the first parameter. The final length of resultset is 16000, because expression evaluation starts from left that is, @x + @z + @y => (@x + @z) + @y. { aaaaaa, aaaab, aabaa, aabb, baaaa, baab, bbaa, bbb} LLLL is the set of strings formed by concatenating. value's type informs its capabilities. In C++ you can store and manipulate such values in string variables, which are really just arrays of characters, but used in a particular way. Called by the ToPrimitive abstract operation. 2) to_data_set. Microsoft Flow in particular makes the design of a workflow easy with a rich design experience - except when it comes to expressions. Convert a Numeric Field to Text to Concatenate I have an Access 2007 form and I have four fields PlantName (text), Category (text), Type (numeric), SeqNo (numeric). However, in macro, there is no MAX or MIN operator, and macro does not recognize IN or ':', as does the DATA step. Take note that for the 'IL operator' column: Only the line in which the operator is used will be displayed. English English; Español Spanish; Deutsch German; Français French; 日本語 Japanese; 한국어 Korean; Português. this String class method returns a new string that is the uppercase equivalent of the string contained in the calling object scope - a variable's ______ is part of the program where a variable may be accessed by its name. This guide is the definitive documentation for the NiFi Expression Language. It’s often convenient to return the result combined in a way that is different than just ‘field, comma/tab, field’. How can I display the date also in the formula cells?. Both char1 and char2 can be any of the datatypes CHAR, VARCHAR2, NCHAR, NVARCHAR2, CLOB, or NCLOB. Expression objects are special language objects which contain parsed but unevaluated R statements. In livecode (programming language) what is the expressions to concatenate strings and arrays using the and operator? N5 level if that helps. Chapter 6 Expression Language. VBScript is a scripting language of QTP/UFT. Python strings are "immutable" which means they cannot be changed after they are created (Java strings also use this immutable style). Given language L, LR is the set of strings whose reversal is in L. For example I have some JSON. Hey guys, I'm hoping one of you will help me write this expression in PS Query tool. Apache Nifi Expression language allows dynmic values in functional fields. All functions are case-sensitive. String interpolation is a term used to describe the process of evaluating a string value that is contained as one or more placeholders. How to split strings using regular expressions. If any input is a cell array, and none are string arrays, then the result is a cell array of character vectors. Looking at the code, I see several places that we can improve the heap that NiFi uses for FlowFiles: When StandardPreparedQuery is used (any time Expression Language is evaluated), it creates a StringBuilder and iterates over all Expressions, evaluating them and concatenating the results together. Join GitHub today. String returns the string value of node. The concat, concat_ws and format functions are variadic, so it is possible to pass the values to be concatenated or formatted as an array marked with the VARIADIC keyword (see Section 37. [expr2], where expr1 has type string and expr2 has type int, e. toPrimitive # A method that converts an object to a corresponding primitive value. givenName == s; //s is a string variable; Object/array creation expression - these expressions return an object of compound value type or anonymous type or an array of such objects. Well, concatenation of languages is defined as: L1 L2 = {xy | x ∈ L1, y ∈ L2}. CString: A string data type. Since normalization is a costly operation not suitable for language primitives it's assumed to be enforced by the user. The Spring Expression Language (SpEL) is a powerful expression language that supports querying and manipulating an object graph at runtime. Strings have the usual meaning: a sequence of characters. Regular Expressions in the Filter Command. Unlike Java, which concatenates number with string without declaring number as string, Python requires declaring the number as string otherwise it will show a TypeError. NOT: Logical-NOT. concat: Combines the text of two strings and returns a new string. Suppose the regular expressions p and q denote sets P and Q, respectively. The system identifies macros using special parentheses. A regular expression method that splits a string at the indices that match the regular expression. The regular expression syntax understood by this package when parsing with the Perl flag is as follows. If the user doesn't define a macro +// in this list, Google Test will define it. Hive string functions look like SQL string functions. an expression that would exceed the implementation-defined limits an expression whose evaluation leads to any form of core language undefined behavior (including signed integer overflow, division by zero, pointer arithmetic outside array bounds, etc). If you're used to other languages that have regular expressions to match text, remember that Lua's pattern matching is not the same: it's more limited, and has different syntax. Between the start and end delimiters is the text of the Expression. Concat (string m, string n) Hive > select concat (‘data’,’ ware’) Result: Dataware: It results in the string by doing concatenation of two strings, this can take any number of inputs. 0 if-then-else logic. concat") > (ListE $ strings) > where. Consider this example:. , CTE, I got an idea to use it to concatenate the values of a field in one string, since it can be used to work recursively. , You have to use the updateAttribute to store the 'Incoming. No semicolons are used at the end of statements, only newlines are used to end a statement. If an interpolated string contains no expressions, ReSharper highlights the $ sign as redundant and helps you remove it: If you need to quickly add the $ at the beginning of the string when you deep into typing out the string, you can press Alt+Enter and choose To string interpolation. The Fresnel Selector Language (FSL) is a language for modeling traversal paths in RDF graphs. A logical expression contains relational and logical operators, gives a logical interpretation to the operands, and produces a boolean result: TRUE (1) or FALSE (0). lowercase¶ A string containing all the characters that are considered lowercase letters. search() Executes the search for a match between a regular expression and a specified string. In this chapter, I will discuss one such tool, regular expressions. Can anyone explain why language concatenation works like this there is a string in the language we are concatenating with to choose (namely the empty string. If the trimmed value is shorter than the length of the receiving variable, SAS pads the value with new blanks as it assigns it to the variable. Goddard 2: 17. Returns a string consisting of the elements of the object repeated the given times. Breaking news from around the world Get the Bing + MSN extension. Although True BASIC explicitly recognizes only two kinds of variables, numeric and string, it implicitly distinguishes between floating point (real) and integer numeric variables. For example, given a schema such as:. The concat, concat_ws and format functions are variadic, so it is possible to pass the values to be concatenated or formatted as an array marked with the VARIADIC keyword (see Section 37. Called by the ToPrimitive abstract operation. 0 Beta 2, the next major release of our database engine, featuring MemSQL SingleStore – a breakthrough new way. Reference guide to using functions in expressions for Azure Logic Apps and Microsoft Flow. And I manually add two properties for the header properties to add. This article will give an introduction to Jayway JsonPath, a Java implementation of the JSONPath specification. Some of the high-level capabilities and objectives of Apache NiFi include: Web-based user interface Seamless experience between design, control, feedback, and monitoring; Highly configurable. This chapter introduces the Expression Language (also referred to as the EL), which provides an important mechanism for enabling the presentation layer (web pages) to communicate with the application logic (backing beans). An inputed language is accepted by a computational model if it runs through the model and ends in an accepting final state. file_getprop(filename, key). Breaking news from around the world Get the Bing + MSN extension. Perl provides numeric operators to help you operate on numbers including arithmetic, Boolean and bitwise operations. All functions are case-sensitive. From this selection of operators (union, concatenation, and star) one can construct an NFA with a size linear to the size of the expression. This page may be useful to : perform statistical text analysis. This is a very simple and effective calculation to concatenate (join) two or more fields in Tableau. It was released in Excel 2016 and replaces the CONCATENATE function. This is also known as the string formatting or interpolation operator. For example, you can create a full name by joining two string-like Firstname and Lastname. But my e-mail just shows "concat string is @concat('hello','world')" , instead of hello world. The "Unknown:"s below indicate that an entry is incomplete. JEXL implements an Expression Language based on some extensions to the JSTL Expression Language supporting most of the constructs seen in shell-script or ECMAScript. Can anyone explain why language concatenation works like this there is a string in the language we are concatenating with to choose (namely the empty string. VBScript is a scripting language of QTP/UFT. This MSAccess tutorial explains how to use the Access & operator to conatentate strings together with syntax and examples. ='), which appends the argument on the right. in the properties i have created a property "filetofetch" with following expression ${filename:contains('INCOMING. In examples of previous post you've learned some of table functions such as Table. Outer Joins An inner join excludes rows from either table that don't have a matching row in the other table. There are several operators available in the language:. If the ending index is omitted, the substring continues to the end of the String. Truncates a date up to a significant component. The result is a C++ string object that may be assigned to another C++ string object, passed to a function that takes a C++ string object as an argument, printed, etc. " and an underscore is used for statements that go multiple lines!. If a delimiter is specified, concatenated values are separated by that delimiter; otherwise, a comma is used as a delimiter. Everything remains inside your NiFi installation. A previous blog post showed how to use NiFi for an NLP pipeline and extending it with language detection to it would be a great addition! This processor performs the language detection inside the NiFi process. And I manually add two properties for the header properties to add. That means that you can store any binary data into a string. Expressions. On most platforms, the concatenation operator is two solid vertical bars, as shown in Table 4-3. Regular expressions can be built from these simple regular expressions with parenthesis, in addition to union, Kleene star and concatenation operators. The specific value is locale-dependent, and will be updated when locale. Apache NiFi - MiNiFi - C++ supports a subset of the Apache NiFi Expression Language (EL). The Boolean negation operator !, unary negation - (and no-op +), unary pre-fix, and post-fix increment using ++ and -- Of course, parentheses can be used to change the normal operator precedence. 2) to_data_set. If it's empty, I want to use some default text. Solution: Since any string of even length can be expressed as the concatenation of strings of length 2 and since the strings of length 2 are aa, ab, ba, bb, a regular expression corresponding to the language is ( aa + ab + ba + bb ) *. For example, in the C language x+5 is an expression, as is the character string "MONKEYS. For example, ${filename} will return the value of the “filename” attribute. Variables form the basis of programming. Use expressions in flow actions Stephen Siciliano , Principal Group PM Manager, Microsoft Flow , Thursday, July 27, 2017 Flow has a rich set of actions, but sometimes users just need to do basic operations like getting the current time, adding numbers together, or replacing a part of a string of text. { aaaaaa, aaaab, aabaa, aabb, baaaa, baab, bbaa, bbb} LLLL is the set of strings formed by concatenating. The starting index is inclusive (the corresponding character is included in the substring), but the optional ending index is exclusive (the corresponding character is not included in the substring). In particular, the order of evaluation of expressions used for concatenation is undefined in the awk language. 0 is the current recommended version of OData. After installation complete, click “Start Data Integration” check box to start service and launch URL in default browser. For example, to concatenate the words "foot" and "ball" would give you "football". … a theory is useful to concatenate facts …. Strings also have a special syntax for accessing a character by its index (i. The example developed here was built against Apache NiFi 0. The expression expr 1. If the user doesn't define a macro +// in this list, Google Test will define it. The first character has number 0; the last character has number n −1, where n is the length of the string. If you know SQL or have interacted with databases, you might be familiar with some of the Query of Queries functionality. Hopefully, you are more familiar with the term yourself because it's a crucial element of any programming language, especially. You may also use expression language such as ${file. Goddard 2: 17. [ expr 2] returns the value of character number expr 2 in the string denoted by expr 1. Hi, I have a column of numbers and another one of strings, say A, B and C in A2:A4 and 1,2,3 in B2:B4. Table of Contents Functions for Replacing, Concatenating or Encoding Strings. Neither square brackets [ ] nor curly braces { } are used. unique-id) Expression Language is not supported in the JSONPath expressions, so if you need to use flow file attributes you'll need the additional processor to join the two attributes together as you described. Trunc ¶ class Trunc(expression, kind, output_field=None, tzinfo=None, **extra) [source] ¶. Concatenation ("adding" strings together) It is possible to "add" strings together, which really means concatenation. Hello, I've created the follwing basic flow in order to test the WDL. Apache Nifi Expression language allows dynmic values in functional fields. > paste('this string is concatenated', 'to this string') Not exactly intuitive eh? Even more confusing since R uses a lot of UNIX idioms… and in this case, the paste command (which in UNIX is used to combine files) performs a rather different role. Hi, does anyone know if something like is possible ? (problem is that I would like different texts for different rows in a datatable using a message. Use CONCATENATE, one of the text functions, to join two or more text strings into one string. For example, you could concatenate first, middle, and last name fields into a single field containing full names, or concatenate vendor ID and location code fields to produce unique identifiers for each outlet of every retail chain in a table. A non-standard string literal looks like a regular double-quoted string literal, but is immediately prefixed by an identifier, and doesn't behave quite like a normal string literal. Evaluating Expressions Using Spring Expression Language (SpEL) The Spring Expression Language (SpEL) is a powerful expression language that supports querying, manipulating as well as evaluating. Whenever you have a piece of data to work with, you will have to declare a variable. true or FUNC() would never execute FUNC). Later you will compose primitive data types together to form composite data types. 14, 12 First let's see how to access an array of String variables using OGNL. You may also use expression language such as ${file. It can save you a lot of coding, because you can dynamically assign values at runtime. 2) to_data_set. Strings are finite sequences of characters. toPrimitive # A method that converts an object to a corresponding primitive value. The expression language supports operators to enable you to create more complex expressions. 0 and the expression language created for JavaServer Faces technology (see Chapter 10, JavaServer Faces Technology) version 1. Pig: a data-flow language and environment for exploring very large datasets. If numeric values appear in string concatenation, they are converted to strings. 5 Ways Cheatography Benefits Your BusinessCheatography Cheat Sheets are a great timesaver for individuals - coders, gardeners, musicians, everybody!But businesses can benefit from them as well - read on to find out more. An expression is a formula that operates on some values and returns a result, such as a formula in a spreadsheet cell. you've learned that M is a functional language that apply data transformations through script. Each array being concatenated must have the same number of characters. type', and 'field. Online validator result is also [ "(0)", "(0)" ] I suppose I have to point on the single entry and not to all entries of the array. The final length of resultset is 16000, because expression evaluation starts from left that is, @x + @z + @y => (@x + @z) + @y. Example1: ASCII('hadoop') returns 104 Example2: ASCII('A') returns 65 CONCAT( string str1, string str2 ) The CONCAT function concatenates all the stings. There is guaranteed to be at least one valid. It can be used with XML or annotation-based Spring configurations. The script grabs up to 1000 flow files, then for each one, it reads in the schema from the avro. The joined items can be text, numbers or Boolean values represented as text, or a combination of those items. Since the & operator will concatenate string values that are enclosed in quotation marks, it isn't straight forward how to add a quotation mark character to the concatenated results. As such, the supported language features are based on the current installed JSP bundle. So I'm trying to concatenate this string with '/2'. Sets and LDAP distinguished names (DNs) are special cases of the string data type. Definition of concatenate. toStringTag # A String value that is used in the creation of the default string description of an object. You can construct arrays of simple data types, such as INT64 , and complex data types, such as STRUCT s. CONCATENATE(, ,…) The CONCATENATE function joins multiple text strings into one text string. Regular expressions are both terribly awkward and extremely useful. The implementation used for Granite UI is javax. 4 – Strings. This class also provides methods to find a substring in a string, find the index of a character or substring, replace characters, split a string, trim a string, and add padding to a string. It is based on a subset of the JavaScript Programming Language Standard ECMA-262 3rd Edition - December 1999. The concatenation operator cannot be used with arithmetic operators. C# Language Escaping Double Quotes Example Double Quotes inside verbatim strings can be escaped by using 2 sequential double quotes "" to represent one double quote " in the resulting string. 3 From concatenating strings to template 6. Language Syntax n Syntax is the description of which strings of symbols are meaningful expressions in a language n It takes more than syntax to understand a language; need meaning (semantics) too n Syntax is the entry point. Scripting language manual. However, in macro, there is no MAX or MIN operator, and macro does not recognize IN or ':', as does the DATA step. Regular Expressions are added as User-Defined Properties where the name of the property is the name of the relationship and the value is a Regular Expression to match against the FlowFile content. concatenated; concatenating. NiFi System Administrator’s Guide How to install and start Data Integration. concatenate attributes. Strings are finite sequences of characters. Converts a Date to a String in the given format. And I manually add two properties for the header properties to add. Hello Experts, I was wondering when using the Concatenate() function, that we can only add two strings. This chapter introduces the Expression Language (also referred to as the EL), which provides an important mechanism for enabling the presentation layer (web pages) to communicate with the application logic (backing beans). An expression is basically any code that returns a value. Each FlowFile will be emitted with the count of FlowFiles and total aggregate value of values processed in the current time window. It is recommended that the Processor be configured with only a single incoming connection, as Group of FlowFiles will not be created from FlowFiles in different connections. Note: I was surprised to find that part A is the fastest. 5 Ways Cheatography Benefits Your BusinessCheatography Cheat Sheets are a great timesaver for individuals - coders, gardeners, musicians, everybody!But businesses can benefit from them as well - read on to find out more. Strings are supported by a series of VBScript string functions, including Left, InStr, and Chr. Here are several descriptions of sets, along with several regular expressions. MergeContent Description: Merges a Group of FlowFiles together based on a user-defined strategy and packages them into a single FlowFile. For instance I have 3 Calculated columns: Col1 Col2 Col3 I have an additional calculated column that creates the string value: Col4 The current Formula that I have for Col4 is: =CONCATENATE(Col1,-Col2,-Col3) So if my columns = Col1=24 Col2=45 Col3=87 Then Col4 should. A filter is an ASCII string containing a filtering expression. On most platforms, the concatenation operator is two solid vertical bars, as shown in Table 4-3. For example, if the value of either foo or bar in the expression `foo + bar' happens to be a string, it is converted to a number before the addition is performed. The second is the concatenating assignment operator ('. There are several operators available in the language:. up vote 8 down vote favorite. This process is referred to as concatenation. Unfortunately, XPath 1. Python List Operations: Concatenation, Multiplication, Slicing & del was posted by Jared on October 3rd, 2014. String: ATL_ID "ATL" protected final java. Existing ways to concatenate text strings So far in DAX, there have been two functions … Continue reading "New DAX function: COMBINEVALUES". The Boolean negation operator !, unary negation - (and no-op +), unary pre-fix, and post-fix increment using ++ and -- Of course, parentheses can be used to change the normal operator precedence. CONCATENATE(, ,…) The CONCATENATE function joins multiple text strings into one text string. It has the power (but not syntax) of the Lower order Predicate Calculus plus simple set_theory. STRING_AGG STRING_AGG([DISTINCT] expression [, delimiter] [ORDER BY key [{ASC|DESC}] [, ]] [LIMIT n]) [OVER ()] Description. In the action class we create a string. prefixed by 0's). Answer: Since the CONCAT function will only let you concatenate 2 strings, you will need to nest multiple CONCAT functions to concatenate more than 2 strings together. Split String: Split a String, Extract Substrings by Delimiters. For example, addition is an example of a mathematical operator and concatenation is an example of a string operator. On the other hand, there is a significant way in which string concatenation and repetition are different from integer addition and multiplication. concatenate( , ) Concatenates values together and returns a string. I'm given the following regular expression (a + b)* (abba* + (ab)*ba) Can Stack Exchange Network Stack Exchange network consists of 175 Q&A communities including Stack Overflow , the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. com on Dec 19, 2016 Latest reply on Oct 11, 2019 by Miralem. Operators in macro expressions are a subset of those in the DATA step (Macro Language Operators). Mathematical Operators. This page may be useful to : perform statistical text analysis. XQuery Language Reference SQL Server 2012 Books Online Summary: XQuery is a language that can query structured or semi-structured XML data. Scripting language manual. 2) to_data_set. The atoms of the formula are symbols of the alphabet, the empty language ∅, and the empty word. When an immutable string is provided to a procedure like string-set!, the exn:fail:contract exception is raised. Concatenation, joining strings. Expressions are used to refer to or compute values within a configuration. EL Expression in Data Binding. Unfortunately, XPath 1. D< YYYYMMDD> so today 21 MARTS 2017 the filename would be. PHP implicitly supports the following data types. The string concatenation operator can concat not only string but primitive values also. Resolver Mapping Template Programming Guide This is a cookbook-style tutorial of programming with the Apache Velocity Template Language (VTL) in AWS AppSync. ' or '_') using the UpdateAttribute processor. When naming variables, note that Python is case sensitive, so yield is not the same as Yield. If it's empty, I want to use some default text. Owner false Owner false false true Group Sets the group on the output file to the value of this. The expressions must be strings; it can't concatenate blobs. Skip navigation links. For example, to concatenate the FirstName field with the LastName field and then check if that result matches a pattern, use the following expression:. In an alien language, surprisingly they also use english lowercase letters, but possibly in a different order. This document will be updated over time as new capabilities are added to the language. , f0;1gor UNICODE) and M and N are regular expressions Each regular expression de nes a language over the alphabet (a set of strings that belong to the language). For example, =CONCATENATE(B2,' ',C2) combines the text in cells B2 and C2, adding a space between the text. Chapter 6 Expression Language. Everything remains inside your NiFi installation. are present, there may be several different ways in which a given StringExpression can match a particular string. Then we compute products in a nested loop and sum up all the products. Java String replace() Method example In the following example we are have a string str and we are demonstrating the use of replace() method using the String str. This might touch Randal, but it's true. ; either the entry doesn't exist in the language, and please tell so. So I'm trying to concatenate this string with '/2'. prefixed by 0's). Regular expressions, byte array literals and version number literals, as described below, are some examples of non-standard string literals. The expression selects which packets will be dumped. The below list of common functions aims to help programmers find the equivalent function in a language. String +length(): int Returns the number of characters in this string. split: Splits a String object into an array of strings by separating the string into substrings. There are two concatenation operators, + and &. 3) from_data_set. Or text to concatenate, if a single value is provided for the first parameter. 2) to_data_set. Camunda BPM supports Unified Expression Language (EL), specified as part of the JSP 2. Concatenation. If variables are padded with trailing blanks, check the lengths of the variables and use the TRIM function to trim trailing blanks from values before concatenating them. You may also use expression language such as ${file. When we create a string using string literal, it will be created in string pool but what if we create a string using new keyword with the same value that exists in string pool?.