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[SPARK-9400] [SQL] codegen for StringLocate #8330

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[SPARK-9400] [SQL] codegen for StringLocate #8330

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4c27625
[SPARK-9400][SQL] codeGen stringLocate
tarekbecker Jul 30, 2015
b737590
[SPARK-9400][SQL] removed unnecessary semicolon
tarekbecker Jul 30, 2015
ba54970
Merge branch 'master' of github.com:apache/spark into stringLocate
Aug 20, 2015
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28 changes: 27 additions & 1 deletion ...catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringExpressions.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -409,13 +409,14 @@ case class SubstringIndex(strExpr: Expression, delimExpr: Expression, countExpr:
* in given string after position pos.
*/
case class StringLocate(substr: Expression, str: Expression, start: Expression)
extends TernaryExpression with ImplicitCastInputTypes with CodegenFallback {
extends TernaryExpression with ImplicitCastInputTypes {

def this(substr: Expression, str: Expression) = {
this(substr, str, Literal(0))
}

override def children: Seq[Expression] = substr :: str :: start :: Nil
override def nullable: Boolean = substr.nullable || str.nullable
override def dataType: DataType = IntegerType
override def inputTypes: Seq[DataType] = Seq(StringType, StringType, IntegerType)

Expand All @@ -441,6 +442,31 @@ case class StringLocate(substr: Expression, str: Expression, start: Expression)
}
}

override protected def genCode(ctx: CodeGenContext, ev: GeneratedExpressionCode): String = {
val substrGen = substr.gen(ctx)
val strGen = str.gen(ctx)
val startGen = start.gen(ctx)
s"""
int ${ev.primitive} = 0;
boolean ${ev.isNull} = false;
${startGen.code}
if (!${startGen.isNull}) {
${substrGen.code}
if (!${substrGen.isNull}) {
${strGen.code}
if (!${strGen.isNull}) {
${ev.primitive} = ${strGen.primitive}.indexOf(${substrGen.primitive},
${startGen.primitive}) + 1;
} else {
${ev.isNull} = true;
}
} else {
${ev.isNull} = true;
}
}
"""
}

override def prettyName: String = "locate"
}

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