[jira] [Commented] (SPARK-12904) Strength reduction for integer/decimal comparisons

["Reynold Xin (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-12904?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15106436#comment-15106436 ] 

Reynold Xin commented on SPARK-12904:
-------------------------------------

[~viirya] maybe you can add this when you have a chance. Thanks!


> Strength reduction for integer/decimal comparisons
> --------------------------------------------------
>
>                 Key: SPARK-12904
>                 URL: https://issues.apache.org/jira/browse/SPARK-12904
>             Project: Spark
>          Issue Type: Bug
>          Components: Optimizer, SQL
>            Reporter: Reynold Xin
>
> We can do the following strength reduction for comparisons between an integral column and a decimal literal:
> 1. int_col > decimal_literal => int_col > floor(decimal_literal)
> 2. int_col >= decimal_literal => int_col > ceil(decimal_literal)
> 3. int_col < decimal_literal => int_col < floor(decimal_literal)
> 4. int_col <= decimal_literal => int_col < ceil(decimal_literal)
> This is more useful as soon as we start parsing floating point numeric literals as decimals rather than doubles (SPARK-12848).



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