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href="../../image-testpage.html">Image testing page</a> </li> </ul> </li> </ul> </nav> </div> <div class="nav-panel-explore" data-panel="explore"> <div class="context"> <span class="title">User manual</span> <span class="version">latest</span> </div> <ul class="components"> <li class="component"> <span class="title">Development Documentation</span> <ul class="versions"> <li class="version is-latest"> <a href="../../../../dev-manual/latest/index.html">latest</a> </li> </ul> </li> <li class="component"> <span class="title">Technical Documentation</span> <ul class="versions"> <li class="version is-latest"> <a href="../../../../tech-manual/latest/index.html">latest</a> </li> </ul> </li> <li class="component is-current"> <span class="title">User manual</span> <ul class="versions"> <li class="version is-current is-latest"> <a href="../../index.html">latest</a> </li> </ul> </li> </ul> </div> </div> </aside> </div> <main> <div class="toolbar" role="navigation"> <button class="nav-toggle"></button> <a href="../../index.html" class="home-link"></a> <nav class="breadcrumbs" aria-label="breadcrumbs"> <ul> <li><a href="../../index.html">User manual</a></li> <li><a href="../plugins.html">Plugins</a></li> <li><a href="../transforms.html">Transform Plugins</a></li> <li><a href="calculator.html">Calculator</a></li> </ul> </nav> <div class="edit-this-page"><a href="https://github.com/apache/incubator-hop/edit/master/plugins/transforms/calculator/src/main/doc/calculator.adoc">Edit this Page</a></div> </div> <article class="doc"> <h1 class="page">Calculator</h1> <div class="sect1"> <h2 id="_description"><a class="anchor" href="#_description"></a>Description</h2> <div class="sectionbody"> <div class="paragraph"> <p>This calculator transform provides you with predefined functions that can be executed on input field values.</p> </div> <div class="paragraph"> <p><strong><em>Note:</em></strong> The execution speed of the Calculator is far better than the speed provided by custom scripts (JavaScript).</p> </div> <div class="paragraph"> <p>Besides the arguments (Field A, Field B and Field C) you must also specify the return type of the function. You can also choose to remove the field from the result (output) after all values are calculated; this is useful for removing temporary values.</p> </div> </div> </div> <div class="sect1"> <h2 id="_options"><a class="anchor" href="#_options"></a>Options</h2> <div class="sectionbody"> <div class="table-wrapper"><table class="tableblock frame-all grid-all"> <colgroup> <col> <col> </colgroup> <thead> <tr> <th class="tableblock halign-left valign-top">Function</th> <th class="tableblock halign-left valign-top">Description</th> </tr> </thead> <tbody> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Set field to constant A</p></td> <td class="tableblock halign-left valign-top"></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Create a copy of field A</p></td> <td class="tableblock halign-left valign-top"></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">A + B</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">A plus B.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">A - B</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">A minus B.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">A * B</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">A multiplied by B.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">A / B</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">A divided by B.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">A * A</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">The square of A.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">SQRT( A )</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">The square root of A.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">100 * A / B</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Percentage of A in B.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">A - ( A * B / 100 )</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Subtract B% of A.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">A + ( A * B / 100 )</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Add B% to A.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">A + B *C</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Add A and B times C.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">SQRT( A*A + B*B )</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Calculate ?(A2+B2).</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">ROUND( A )</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Returns the closest Integer to the argument. The result is rounded to an Integer by adding 1/2, taking the floor of the result, and casting the result to type int. In other words, the result is equal to the value of the expression: floor (a + 0.5). In case you need the rounding method "Round half to even", use the following method ROUND( A, B ) with no decimals (B=0).</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">ROUND( A, B )</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Round A to the nearest even number with B decimals. The used rounding method is "Round half to even", it is also called unbiased rounding, convergent rounding, statistician’s rounding, Dutch rounding, Gaussian rounding, odd-even rounding, bankers' rounding or broken rounding, and is widely used in bookkeeping. This is the default rounding mode used in IEEE 754 computing functions and operators. In Germany it is often called "Mathematisches Runden".</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">STDROUND( A )</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Round A to the nearest integer. The used rounding method is "Round half away from zero", it is also called standard or common rounding. In Germany it is known as "kaufmännische Rundung" (and defined in DIN 1333).</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">STDROUND( A, B )</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Same rounding method used as in STDROUND (A) but with B decimals.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">CEIL( A )</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">The ceiling function map a number to the smallest following integer.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">FLOOR( A )</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">The floor function map a number to the largest previous integer.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">NVL( A, B )</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">If A is not NULL, return A, else B. Note that sometimes your variable won’t be null but an empty string.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Date A + B days</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Add B days to Date field A. Note: Only integer values for B are supported. If you need non-integer calculations, please add a second calculation with hours.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Year of date A</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Calculate the year of date A.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Month of date A</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Calculate number the month of date A.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Day of year of date</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">A Calculate the day of year (1-365).</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Day of month of date A</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Calculate the day of month (1-31).</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Day of week of date A</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Calculate the day of week (1-7).</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Week of year of date A</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Calculate the week of year (1-54).</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">ISO8601 Week of year of date A</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Calculate the week of the year ISO8601 style (1-53).</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">ISO8601 Year of date A</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Calculate the year ISO8601 style.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Byte to hex encode of string A</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Encode bytes in a string to a hexadecimal representation.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Hex encode of string A</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Encode a string in its own hexadecimal representation.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Char to hex encode of string A</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Encode characters in a string to a hexadecimal representation.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Hex decode of string A</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Decode a string from its hexadecimal representation (add a leading 0 when A is of odd length).</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Checksum of a file A using CRC-32</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Calculate the checksum of a file using CRC-32.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Checksum of a file A using Adler-32</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Calculate the checksum of a file using Adler-32.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Checksum of a file A using MD5</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Calculate the checksum of a file using MD5.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Checksum of a file A using SHA-1</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Calculate the checksum of a file using SHA-1.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Levenshtein Distance (Source A and Target B)</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Calculates the Levenshtein Distance: <a href="http://en.wikipedia.org/wiki/Levenshtein_distance" class="bare">http://en.wikipedia.org/wiki/Levenshtein_distance</a></p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Metaphone of A (Phonetics)</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Calculates the metaphone of A: <a href="http://en.wikipedia.org/wiki/Metaphone" class="bare">http://en.wikipedia.org/wiki/Metaphone</a></p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Double metaphone of A</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Calculates the double metaphone of A: <a href="http://en.wikipedia.org/wiki/Double_Metaphone" class="bare">http://en.wikipedia.org/wiki/Double_Metaphone</a></p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Absolute value ABS(A)</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Calculates the Absolute value of A.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Remove time from a date A</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Removes time value of A. Note: Daylight Savings Time (DST) changes in Sao Paulo and some other parts of Brazil at midnight 0:00. This makes it impossible to set the time to 0:00 at the specific date, when the DST changes from 0:00 to 1:00 am. So, there is one date in one year in these regions where this function will fail with an "IllegalArgumentException: HOUR_OF_DAY: 0 → 1". It is not an issue for Europe, the US and other regions where the time changes at 1:00 or 2:00 or 3:00 am.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Date A - Date B (in days)</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Calculates difference, in days, between A date field and B date field.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">A + B + C</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">A plus B plus C.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">First letter of each word of a string A in capital</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Transforms the first letter of each word within a string.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">UpperCase of a string A</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Transforms a string to uppercase.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">LowerCase of a string A</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Transforms a string to lowercase.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Mask XML content from string A</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Escape XML content; replace characters with &values.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Protect (CDATA) XML content from string A</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Indicates an XML string is general character data, rather than non-character data or character data with a more specific, limited structure. The given string will be enclosed into <![CDATA[String]]>.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Remove CR from a string A</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Removes carriage returns from a string.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Remove LF from a string A</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Removes linefeeds from a string.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Remove CRLF from a string A</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Removes carriage returns/linefeeds from a string.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Remove TAB from a string A</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Removes tab characters from a string.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Return only digits from string A</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Outputs only Outputs only digits (0-9) from a string from a string.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Remove digits from string A</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Removes all digits (0-9) from a string.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Return the length of a string A</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Returns the length of the string.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Load file content in binary</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Loads the content of the given file (in field A) to a binary data type (e.g. pictures).</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Add time B to date A</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Add the time to a date, returns date and time as one value.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Quarter of date A</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Returns the quarter (1 to 4) of the date.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">variable substitution in string A</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Substitute variables within a string.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Unescape XML content</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Unescape XML content from the string.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Escape HTML content</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Escape HTML within the string.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Unescape HTML content</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Unescape HTML within the string.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Escape SQL content</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Escapes the characters in a String to be suitable to pass to an SQL query.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Date A - Date B (working days)</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Calculates the difference between Date field A and Date field B (only working days Mon-Fri).</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Date A + B Months</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Add B months to Date field A. Note: Only integer values for B are supported. If you need non-integer calculations, please add a second calculation with days.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Check if an XML file A is well formed</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Validates XML file input.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Check if an XML string A is well formed</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Validates XML string input.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Get encoding of file A</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Guess the best encoding (UTF-8) for the given file.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Dameraulevenshtein distance between String A and String B</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Calculates Dameraulevenshtein distance between strings: <a href="http://en.wikipedia.org/wiki/Damerau%E2%80%93Levenshtein_distance" class="bare">http://en.wikipedia.org/wiki/Damerau%E2%80%93Levenshtein_distance</a></p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">NeedlemanWunsch distance between String A and String B</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Calculates NeedlemanWunsch distance between strings: <a href="http://en.wikipedia.org/wiki/Needleman%E2%80%93Wunsch_algorithm" class="bare">http://en.wikipedia.org/wiki/Needleman%E2%80%93Wunsch_algorithm</a></p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Jaro similitude between String A and String B</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Returns the Jaro similarity coefficient between two strings.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">JaroWinkler similitude between String A and String B</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Returns the Jaro similarity coefficient between two string: <a href="http://en.wikipedia.org/wiki/Jaro%E2%80%93Winkler_distance" class="bare">http://en.wikipedia.org/wiki/Jaro%E2%80%93Winkler_distance</a></p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">SoundEx of String A</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Encodes a string into a Soundex value.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">RefinedSoundEx of String A</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Retrieves the Refined Soundex code for a given string object</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Date A + B Hours</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Add B hours to Date field. Note: Only integer values for B are supported. If you need non-integer calculations, please add a second calculation with minutes.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Date A + B Minutes</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Add B minutes to Date field. Note: Only integer values for B are supported. If you need non-integer calculations, please add a second calculation with seconds.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Date A - Date B (milliseconds)</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Subtract B milliseconds from Date field A</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Date A - Date B (seconds)</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Subtract B seconds from Date field A. Note: Only integer values for B are supported. If you need non-integer calculations, please add a second calculation with milliseconds.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Date A - Date B (minutes)</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Subtract B minutes from Date field A. Note: Only integer values for B are supported. If you need non-integer calculations, please add a second calculation with seconds.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Date A - Date B (hours)</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Subtract B hours from Date field A. Note: Only integer values for B are supported. If you need non-integer calculations, please add a second calculation with minutes.</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Hour of Day of Date A</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Extract the hour part of the given date</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Minute of Hour of Date A</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Extract the minute part of the given date</p></td> </tr> <tr> <td class="tableblock halign-left valign-top"><p class="tableblock">Second of Hour of Date A</p></td> <td class="tableblock halign-left valign-top"><p class="tableblock">Extract the second part of a given date</p></td> </tr> </tbody> </table></div> </div> </div> <div class="sect1"> <h2 id="_faq_on_length_and_precision_and_data_types_affecting_the_results"><a class="anchor" href="#_faq_on_length_and_precision_and_data_types_affecting_the_results"></a>FAQ on length and precision and data types affecting the results</h2> <div class="sectionbody"> <div class="paragraph"> <p><strong>Q</strong>: I made a pipeline using A/B in a calculator transform and it rounded wrong: the 2 input fields are integer but my result type was Number(6, 4) so I would expect the integers to be cast to Number before executing the division.</p> </div> <div class="paragraph"> <p>If I wanted to execute e.g. 28/222, I got 0.0 instead of 0.1261 which I expected. So it seems the result type is ignored. If I change the input types both to Number(6, 4) I get as result 0.12612612612612611 which still ignores the result type (4 places after the comma).</p> </div> <div class="paragraph"> <p>Why is this?</p> </div> <div class="paragraph"> <p><strong>A</strong>: Length & Precision are just metadata pieces.</p> </div> <div class="paragraph"> <p>If you want to round to the specified precision, you should do this in another transform. However: please keep in mind that rounding double point precision values is futile anyway. A floating point number is stored as an approximation (it floats) so 0.1261 (your desired output) could (would probably) end up being stored as 0.126099999999 or 0.1261000000001 (Note: this is not the case for BigNumbers)</p> </div> <div class="paragraph"> <p>So in the end we round using BigDecimals once we store the numbers in the output table, but NOT during the pipeline. The same is true for the Text File Output transform. If you would have specified Integer as result type, the internal number format would have been retained, you would press "Get Fields" and it the required Integer type would be filled in. The required conversion would take place there and then.</p> </div> <div class="paragraph"> <p>In short: we convert to the required metadata type when we land the data somewhere, NOT BEFORE.</p> </div> <div class="paragraph"> <p><strong>Q</strong>: How do the data types work internally? <strong>A</strong>: You might notice that if you multiply an Integer and Number, the result is always rounded. That is because Calculator takes data type of the left hand size of the multiplication (A) as the driver for the calculation. As such, if you want more precision, you should put field B on the left hand side or change the data type to Number and all will be well.</p> </div> </div> </div> </article> </main> </div> <footer> <div class="footer"> <dl> <dt>Overview</dt> <dd><a href="../../../../download/">Download</a></dd> <dd><a href="../../../../manual/latest/">Getting started</a></dd> </dl> <dl> <dt>Community</dt> <dd><a target="_blank" href="https://issues.apache.org/jira/projects/HOP/issues">Jira</a></dd> <dd><a target="_blank" href="https://chat.project-hop.org">Chat</a></dd> <dd><a target="_blank" href="../../../../community/team/">Team</a></dd> </dl> <dl> <dt>About</dt> <dd><a target="_blank" href="https://www.apache.org/licenses/" title="License">License</a></dd> </dl> <p> © 2019-2021 The Hop Team.<br> All marks mentioned may be trademarks or registered trademarks of their respective owners. </p> </div> </footer> <script src="../../../../_/js/site-8ed57175ed.js"></script> <script async src="../../../../_/js/vendor/highlight-41b831b4c4.js"></script> <script src="../../../../_/js/vendor/cookies-eu-banner-d4a1518c50.js"></script> <script> new CookiesEuBanner(function () { |
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