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[SPARK-30245][SQL] Add cache for Like and RLike when pattern is not static #26875

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ulysses-you wants to merge 3 commits into from
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[SPARK-30245][SQL] Add cache for Like and RLike when pattern is not static #26875

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5250186
init
ulysses-you Dec 13, 2019
424e0e3
fix
ulysses-you Dec 13, 2019
d6650e1
fix
ulysses-you Dec 24, 2019
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20 changes: 15 additions & 5 deletions ...catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/regexpExpressions.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -152,8 +152,6 @@ case class Like(left: Expression, right: Expression, escapeChar: Char = '\\')
""")
}
} else {
val pattern = ctx.freshName("pattern")
val rightStr = ctx.freshName("rightStr")
// We need double escape to avoid org.codehaus.commons.compiler.CompileException.
// '\\' will cause exception 'Single quote must be backslash-escaped in character literal'.
// '\"' will cause exception 'Line break in literal not allowed'.
Expand All @@ -162,10 +160,17 @@ case class Like(left: Expression, right: Expression, escapeChar: Char = '\\')
} else {
escapeChar
}
val rightStr = ctx.freshName("rightStr")
val pattern = ctx.addMutableState(patternClass, "pattern")
val lastRightStr = ctx.addMutableState(classOf[String].getName, "lastRightStr")

nullSafeCodeGen(ctx, ev, (eval1, eval2) => {
s"""
String $rightStr = $eval2.toString();
$patternClass $pattern = $patternClass.compile($escapeFunc($rightStr, '$newEscapeChar'));
if ($lastRightStr != $rightStr) {

@maropu maropu Dec 13, 2019

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I think this optimization is a corner case and highly depends on input data.... cc: @dongjoon-hyun

@ulysses-you ulysses-you Dec 13, 2019

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Yes, and here I have an another idea.
Now BroadcastNestedLoopJoinExec always loop streamed firstly then nest loop broadcast and the pattern is always at broadcast side.
In inner like join, we can add another optimization that loop broadcast first and then nest loop streamed. So we can use the feature of this pr.

$pattern = $patternClass.compile($escapeFunc($rightStr, '$newEscapeChar'));
$lastRightStr = $rightStr;
}
${ev.value} = $pattern.matcher($eval1.toString()).matches();
"""
})
Expand Down Expand Up @@ -240,11 +245,16 @@ case class RLike(left: Expression, right: Expression) extends StringRegexExpress
}
} else {
val rightStr = ctx.freshName("rightStr")
val pattern = ctx.freshName("pattern")
val pattern = ctx.addMutableState(patternClass, "pattern")
val lastRightStr = ctx.addMutableState(classOf[String].getName, "lastRightStr")

nullSafeCodeGen(ctx, ev, (eval1, eval2) => {
s"""
String $rightStr = $eval2.toString();
$patternClass $pattern = $patternClass.compile($rightStr);
if ($rightStr != $lastRightStr) {

@viirya viirya Dec 24, 2019

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Do you mean to use equals()?

@ulysses-you ulysses-you Dec 24, 2019

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Yes, forget this is not scala code.

$pattern = $patternClass.compile($rightStr);
$lastRightStr = $rightStr;
}
${ev.value} = $pattern.matcher($eval1.toString()).find(0);
"""
})
Expand Down