[jira] [Assigned] (HIVE-26604) Replace vectorization templates with overrides

["Teddy Choi (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-26604?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Teddy Choi reassigned HIVE-26604:
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> Replace vectorization templates with overrides
> ----------------------------------------------
>
>                 Key: HIVE-26604
>                 URL: https://issues.apache.org/jira/browse/HIVE-26604
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Teddy Choi
>            Assignee: Teddy Choi
>            Priority: Major
>
> Replace vectorization templates with overrides.
> h1. Background
> There are many combinations among different data types, column/scalar types, and operators in vectorization. It leaves a lot of code to implement. The current Hive vectorization is implemented with a simple string template engine for it. It replaces a <keyword> with a value at all places within each template file.
> However, the template is written in a text file. It's not natively supported by modern IDEs. Also any change on the template needs a separate Maven step to generate actual code. It's time consuming.
> h1. Design
> The base abstract classes will respect Java's data type system. Each string template will be divided into several sub data types, such as long-long, long-double, double-long, double-double.
>  * ColumnArithmeticColumn.txt will be separated into
>  ** BaseLongColLongColumn.java
>  *** Add: long func(long a, long b) \{ return a + b; }
>  *** Subtract: long func(long a, long b) \{ return a - b; }
>  *** Multiply: long func(long a, long b) \{ return a * b; }
>  *** CheckedAdd: boolean supportsCheckedExecution() \{ return true; }
>  *** CheckedSubtract: boolean supportsCheckedExecution() \{ return true; }
>  *** CheckedMultiply: boolean supportsCheckedExecution() \{ return true; }
>  ** BaseLongColDoubleColumn.java
>  *** Add: double func(long a, double b) \{ return a + b; }
>  *** Subtract, Multiply, CheckedAdd, CheckedSubtract, CheckMultiply
>  ** BaseDoubleColLongColumn.java
>  *** Add: double func(double a, long b) \{ return a + b; }
>  *** Subtract, Multiply, CheckedAdd, CheckedSubtract, CheckMultiply
>  ** BaseDoubleColDoubleColumn.java
>  *** Add: double func(double a, double b) \{ return a + b; }
>  *** Subtract, Multiply, CheckedAdd, CheckedSubtract, CheckedMultiply
>  * ColumnArithmeticScalar.txt
>  ** BaseLongColLongScalar.java
>  *** Add: long func(long a, long b) \{ return a + b; }
>  *** Subtract, Multiply, CheckedAdd, CheckedSubtract, CheckedMultiply
>  ** BaseLongColDoubleScalar.java
>  *** Add: double func(long a, double b) \{ return a + b; }
>  *** Subtract, Multiply, CheckedAdd, CheckedSubtract, CheckedMultiply
>  ** BaseDoubleColLongScalar.java
>  *** Add: double func(double a, long b) \{ return a + b; }
>  *** Subtract, Multiply, CheckedAdd, CheckedSubtract, CheckedMultiply
>  ** BaseDoubleColDoubleColumn.java
>  *** Add: double func(double a, double b) \{ return a + b; }
>  *** Subtract, Multiply, CheckedAdd, CheckedSubtract, CheckedMultiply
>  



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