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From "Mehant Baid" <baid.meh...@gmail.com>
Subject Re: Review Request 16230: DRILL-320: Rework math functions to use codegen.
Date Thu, 19 Dec 2013 06:43:51 GMT

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(Updated Dec. 19, 2013, 6:43 a.m.)

Review request for drill and Jacques Nadeau.


Changed the rules of math functions so we model after Postgres. The output type would match
the input type (the larger one in case of multiple inputs). For example if the input types
to an add function are two tinyint's and we overflow then we simply lose the precision. We
manually don't use a bigger holder to store the result of the addition. 

Bugs: DRILL-320

Repository: drill-git


Rework the implementations of existing math functions to use codegen so that we have a more
complete list of implementations. Previous implementations were done manually so we only had
a handful of implementations for each function. Now that we are using freemarker to generate
code during compile time we can easily have all the required implementations.

We were also missing any implementation for multiply and divide functions, so added that as
part of this JIRA. 

The implementations added here are for inputs with similar types (eg: for the function 'add',
the inputs can be of type INT, INT or FLOAT, FLOAT etc). The expectation is that if we have
implementations for similar types of input, once we have implicit casting we should be able
to cast one of the inputs so that both the inputs are of the same type. 

MathFunctionTypes.tdd, MathFunctionTemplates.java:
The above two files are used by freemarker to generate code for all the types specified in
MathFunctionTypes.tdd using the template specified in MathFunctionTemplates.java. 

ComparisonFunctions.java, SimpleRepeatedFunctions.java: 
Simple modification in these files to use the correct class for logging purposes. 

This class used to contain some implementations for add, subtract methods. Removed those from
here, since we have all the implementations via codegen.

TestMathFunctions.java, simple_math_functions.json:
Added really basic test cases for add and multiply functions. 

Diffs (updated)

  exec/java-exec/src/main/codegen/config.fmpp cd2b2cc 
  exec/java-exec/src/main/codegen/data/MathFunctionTypes.tdd PRE-CREATION 
  exec/java-exec/src/main/codegen/templates/MathFunctionTemplates.java PRE-CREATION 
  exec/java-exec/src/main/java/org/apache/drill/exec/expr/fn/impl/MathFunctions.java 288760b

  exec/java-exec/src/test/java/org/apache/drill/exec/fn/impl/TestMathFunctions.java PRE-CREATION

  exec/java-exec/src/test/resources/functions/simple_math_functions.json PRE-CREATION 

Diff: https://reviews.apache.org/r/16230/diff/


Manual testing using sqlline.

Added basic test cases in TestMathFunctions.java, simple addition and multiplication of constants.


Mehant Baid

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