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(expr: Expression): Unit

addExprTree…FIXME

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

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

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.

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