spark技术分享TypeCoercion Object
TypeCoercion is a Scala object that defines the type coercion rules for Spark Analyzer.
Defining Type Coercion Rules (For Spark Analyzer) — typeCoercionRules Method
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typeCoercionRules(conf: SQLConf): List[Rule[LogicalPlan]] |
typeCoercionRules is a collection of Catalyst rules to transform logical plans (in the order of execution):
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WidenSetOperationTypes -
PromoteStrings -
DecimalPrecision -
BooleanEquality -
FunctionArgumentConversion -
ConcatCoercion -
EltCoercion -
CaseWhenCoercion -
IfCoercion -
StackCoercion -
Division -
ImplicitTypeCasts -
DateTimeOperations
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Note
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typeCoercionRules is used exclusively when Analyzer is requested for batches.
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