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https://issues.apache.org/jira/browse/SPARK-9150?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Reynold Xin updated SPARK-9150:
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Description:
It is very hard to track which expression supports code generation or not. This
patch removes the default gencode implementation from Expression, and moves the
default fallback implementation into a new trait called CodegenFallback. Each
concrete expression needs to either implement code generation, or mix in
CodegenFallback. This makes it very easy to track which expressions have code
generation implemented already.
Additionally, this patch creates an Unevaluable trait that can be used to track
expressions that don't support evaluation (e.g. Star).
was:
It is very hard to track which expression supports code generation or not. This
patch removes the default gencode implementation from Expression, and moves the
default fallback implementation into a new trait called CodegenFallback. Each
concrete expression needs to either implement code generation, or mix in
CodegenFallback.
This makes it very easy to track which expressions have code generation
implemented already.
> Create CodegenFallback and Unevaluable trait
> --------------------------------------------
>
> Key: SPARK-9150
> URL: https://issues.apache.org/jira/browse/SPARK-9150
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Reynold Xin
> Assignee: Reynold Xin
> Priority: Critical
>
> It is very hard to track which expression supports code generation or not.
> This patch removes the default gencode implementation from Expression, and
> moves the default fallback implementation into a new trait called
> CodegenFallback. Each concrete expression needs to either implement code
> generation, or mix in CodegenFallback. This makes it very easy to track which
> expressions have code generation implemented already.
> Additionally, this patch creates an Unevaluable trait that can be used to
> track expressions that don't support evaluation (e.g. Star).
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