fqaiser94 commented on a change in pull request #29795:
URL: https://github.com/apache/spark/pull/29795#discussion_r492435473
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/ComplexTypes.scala
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@@ -39,19 +40,14 @@ object SimplifyExtractValueOps extends Rule[LogicalPlan] {
// Remove redundant field extraction.
case GetStructField(createNamedStruct: CreateNamedStruct, ordinal, _) =>
createNamedStruct.valExprs(ordinal)
- case GetStructField(w @ WithFields(struct, names, valExprs), ordinal,
maybeName) =>
- val name = w.dataType(ordinal).name
- val matches = names.zip(valExprs).filter(_._1 == name)
- if (matches.nonEmpty) {
- // return last matching element as that is the final value for the
field being extracted.
- // For example, if a user submits a query like this:
- // `$"struct_col".withField("b", lit(1)).withField("b",
lit(2)).getField("b")`
- // we want to return `lit(2)` (and not `lit(1)`).
- val expr = matches.last._2
- If(IsNull(struct), Literal(null, expr.dataType), expr)
- } else {
- GetStructField(struct, ordinal, maybeName)
- }
+ case GetStructField(updateFields: UpdateFields, ordinal, _) =>
+ val structExpr = updateFields.structExpr
+ updateFields.newExprs(ordinal) match {
+ // if the struct itself is null, then any value extracted from it
(expr) will be null
+ // so we don't need to wrap expr in If(IsNull(struct), Literal(null,
expr.dataType), expr)
+ case expr: GetStructField if expr.child.semanticEquals(structExpr) =>
expr
+ case expr => If(IsNull(ultimateStruct(structExpr)), Literal(null,
expr.dataType), expr)
Review comment:
IIUC you mean put `CombineUpdateFields` in a separate batch that runs
before the `SimplifyExtractValueOps` batch and remove the `ultimateStruct`
method?
If so, we'll miss out on some optimizations because after
`SimplifyExtractValueOps` runs we might again end up with code containing
`UpdateFields(UpdateFields(_, _))`. The `simplify add multiple nested fields to
struct` test in `complexTypesSuite` is a good example of a test that will fail
in this scenario.
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