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[SPARK-26450][SQL] Avoid rebuilding map of schema for every column in projection #23392

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bersprockets wants to merge 12 commits into from
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[SPARK-26450][SQL] Avoid rebuilding map of schema for every column in projection #23392

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6b66711
Initial commit
bersprockets Dec 12, 2018
a9dbbec
Initial try at helper function
bersprockets Dec 29, 2018
67a943a
Use helper function
bersprockets Dec 31, 2018
3362744
More uses of helper function
bersprockets Dec 31, 2018
306e0a5
Even more uses of helper function
bersprockets Dec 31, 2018
a25b59c
Some clean up
bersprockets Jan 2, 2019
b977d3e
Review feedback
bersprockets Jan 2, 2019
1497d3a
Fix style issue
bersprockets Jan 2, 2019
777c5b4
Move helper function to BindReferences
bersprockets Jan 4, 2019
fbd6787
Handle cases missed before
bersprockets Jan 4, 2019
686e7b5
Review feedback
bersprockets Jan 5, 2019
b1afb3a
Close gap in ExpandExec
bersprockets Jan 13, 2019
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Close gap in ExpandExec
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@bersprockets
bersprockets committed Jan 13, 2019
commit b1afb3a7bb0e1a67ce12c43ac545650e54a37e7c
4 changes: 2 additions & 2 deletions sql/core/src/main/scala/org/apache/spark/sql/execution/ExpandExec.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -145,11 +145,12 @@ case class ExpandExec(
// Part 1: declare variables for each column
// If a column has the same value for all output rows, then we also generate its computation
// right after declaration. Otherwise its value is computed in the part 2.
lazy val attributeSeq: AttributeSeq = child.output
val outputColumns = output.indices.map { col =>
val firstExpr = projections.head(col)
if (sameOutput(col)) {
// This column is the same across all output rows. Just generate code for it here.
BindReferences.bindReference(firstExpr, child.output).genCode(ctx)
BindReferences.bindReference(firstExpr, attributeSeq).genCode(ctx)
} else {
val isNull = ctx.freshName("isNull")
val value = ctx.freshName("value")
Expand All @@ -168,7 +169,6 @@ case class ExpandExec(
// Part 2: switch/case statements
val cases = projections.zipWithIndex.map { case (exprs, row) =>
var updateCode = ""
val attributeSeq: AttributeSeq = child.output
for (col <- exprs.indices) {
if (!sameOutput(col)) {
val ev = BindReferences.bindReference(exprs(col), attributeSeq).genCode(ctx)
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