spark-sql-EquivalentExpressions.adoc

EquivalentExpressions

EquivalentExpressions is…​FIXME

Table 1. EquivalentExpressions’s Internal Properties (e.g. Registries, Counters and Flags)

Name	Description
equivalenceMap	Equivalent sets of expressions, i.e. semantically equal expressions by their Expr "representative" Used when…​FIXME

addExprTree Method

addExprTree(expr: Expression): Unit

addExprTree…​FIXME

Note	addExprTree is used when CodegenContext is requested to subexpressionElimination or subexpressionEliminationForWholeStageCodegen.

addExpr Method

addExpr(expr: Expression): Boolean

addExpr…​FIXME

Note	addExpr is used when: EquivalentExpressions is requested to addExprTree PhysicalAggregation is requested to destructure an Aggregate logical operator

Getting Equivalent Sets Of Expressions — getAllEquivalentExprs Method

getAllEquivalentExprs: Seq[Seq[Expression]]

getAllEquivalentExprs takes the values of all the equivalent sets of expressions.

Note	getAllEquivalentExprs is used when CodegenContext is requested to subexpressionElimination or subexpressionEliminationForWholeStageCodegen.