spark技术分享ExtractPythonUDFs Physical Query Optimization
ExtractPythonUDFs is a physical query optimization (aka physical query preparation rule or simply preparation rule) that QueryExecution uses to optimize the physical plan of a structured query by extracting Python UDFs from a physical query plan (excluding FlatMapGroupsInPandasExec operators that it simply skips over).
Technically, ExtractPythonUDFs is just a Catalyst rule for transforming physical query plans, i.e. Rule[SparkPlan].
ExtractPythonUDFs is part of preparations batch of physical query plan rules and is executed when QueryExecution is requested for the optimized physical query plan (i.e. in executedPlan phase of a query execution).
Extracting Python UDFs from Physical Query Plan — extract Internal Method
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extract(plan: SparkPlan): SparkPlan |
extract…FIXME
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Note
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extract is used exclusively when ExtractPythonUDFs is requested to optimize a physical query plan.
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trySplitFilter Internal Method
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trySplitFilter(plan: SparkPlan): SparkPlan |
trySplitFilter…FIXME
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Note
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trySplitFilter is used exclusively when ExtractPythonUDFs is requested to extract.
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