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[SPARK-39784][SQL] Put Literal values on the right side of the data source filter after translating Catalyst Expression to data source filter #37197

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[SPARK-39784][SQL] Put Literal values on the right side of the data source filter after translating Catalyst Expression to data source filter #37197

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f742b20
Literal values should be on the right side of the data source filter
huaxingao Jul 14, 2022
fa4d57a
normalize V2 attr cmp lit in V2ExpressionBuilder
huaxingao Jul 21, 2022
a708ad6
fix test failure
huaxingao Jul 21, 2022
47e30c4
remove extra space
huaxingao Jul 22, 2022
1e94c53
address comments
huaxingao Jul 22, 2022
324dd87
fix test failure
huaxingao Jul 22, 2022
99b6c45
4 space indentation for breaking a line
huaxingao Jul 22, 2022
a4e8170
address comments
huaxingao Jul 22, 2022
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18 changes: 17 additions & 1 deletion sql/core/src/main/scala/org/apache/spark/sql/catalyst/util/V2ExpressionBuilder.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -234,7 +234,13 @@ class V2ExpressionBuilder(e: Expression, isPredicate: Boolean = false) {
if (l.isDefined && r.isDefined) {
b match {
case _: Predicate =>
Some(new V2Predicate(b.sqlOperator, Array[V2Expression](l.get, r.get)))
if (l.get.isInstanceOf[LiteralValue[_]] && r.get.isInstanceOf[FieldReference]) {
Some(new V2Predicate(flipComparisonOperatorName(b.sqlOperator),
Array[V2Expression](r.get, l.get)))
} else {
Some(new V2Predicate(b.sqlOperator, Array[V2Expression](l.get, r.get)))
}

case _ =>
Some(new GeneralScalarExpression(b.sqlOperator, Array[V2Expression](l.get, r.get)))
}
Expand Down Expand Up @@ -408,6 +414,16 @@ class V2ExpressionBuilder(e: Expression, isPredicate: Boolean = false) {
}
case _ => None
}

private def flipComparisonOperatorName(operatorName: String): String = {
operatorName match {
case ">" => "<"
case "<" => ">"
case ">=" => "<="
case "<=" => ">="
case _ => operatorName
}
}
}

object ColumnOrField {
Expand Down
67 changes: 65 additions & 2 deletions .../test/scala/org/apache/spark/sql/execution/datasources/v2/DataSourceV2StrategySuite.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -18,14 +18,77 @@
package org.apache.spark.sql.execution.datasources.v2

import org.apache.spark.sql.catalyst.dsl.expressions._
import org.apache.spark.sql.catalyst.expressions.Expression
import org.apache.spark.sql.catalyst.expressions._
import org.apache.spark.sql.catalyst.plans.PlanTest
import org.apache.spark.sql.connector.expressions.{FieldReference, LiteralValue}
import org.apache.spark.sql.connector.expressions.filter.Predicate
import org.apache.spark.sql.test.SharedSparkSession
import org.apache.spark.sql.types.BooleanType
import org.apache.spark.sql.types.{BooleanType, IntegerType, StringType, StructField, StructType}

class DataSourceV2StrategySuite extends PlanTest with SharedSparkSession {
val attrInts = Seq(
$"cint".int,
$"c.int".int,
GetStructField($"a".struct(StructType(
StructField("cstr", StringType, nullable = true) ::
StructField("cint", IntegerType, nullable = true) :: Nil)), 1, None),
GetStructField($"a".struct(StructType(
StructField("c.int", IntegerType, nullable = true) ::
StructField("cstr", StringType, nullable = true) :: Nil)), 0, None),
GetStructField($"a.b".struct(StructType(
StructField("cstr1", StringType, nullable = true) ::
StructField("cstr2", StringType, nullable = true) ::
StructField("cint", IntegerType, nullable = true) :: Nil)), 2, None),
GetStructField($"a.b".struct(StructType(
StructField("c.int", IntegerType, nullable = true) :: Nil)), 0, None),
GetStructField(GetStructField($"a".struct(StructType(
StructField("cstr1", StringType, nullable = true) ::
StructField("b", StructType(StructField("cint", IntegerType, nullable = true) ::
StructField("cstr2", StringType, nullable = true) :: Nil)) :: Nil)), 1, None), 0, None)
).zip(Seq(
"cint",
"`c.int`", // single level field that contains `dot` in name
"a.cint", // two level nested field
"a.`c.int`", // two level nested field, and nested level contains `dot`
"`a.b`.cint", // two level nested field, and top level contains `dot`
"`a.b`.`c.int`", // two level nested field, and both levels contain `dot`
"a.b.cint" // three level nested field
))

test("translate simple expression") { attrInts
.foreach { case (attrInt, intColName) =>
testTranslateFilter(EqualTo(attrInt, 1),
Some(new Predicate("=", Array(FieldReference(intColName), LiteralValue(1, IntegerType)))))
testTranslateFilter(EqualTo(1, attrInt),
Some(new Predicate("=", Array(FieldReference(intColName), LiteralValue(1, IntegerType)))))

testTranslateFilter(EqualNullSafe(attrInt, 1),
Some(new Predicate("<=>", Array(FieldReference(intColName), LiteralValue(1, IntegerType)))))
testTranslateFilter(EqualNullSafe(1, attrInt),
Some(new Predicate("<=>", Array(FieldReference(intColName), LiteralValue(1, IntegerType)))))

testTranslateFilter(GreaterThan(attrInt, 1),
Some(new Predicate(">", Array(FieldReference(intColName), LiteralValue(1, IntegerType)))))
testTranslateFilter(GreaterThan(1, attrInt),
Some(new Predicate("<", Array(FieldReference(intColName), LiteralValue(1, IntegerType)))))

testTranslateFilter(LessThan(attrInt, 1),
Some(new Predicate("<", Array(FieldReference(intColName), LiteralValue(1, IntegerType)))))
testTranslateFilter(LessThan(1, attrInt),
Some(new Predicate(">", Array(FieldReference(intColName), LiteralValue(1, IntegerType)))))

testTranslateFilter(GreaterThanOrEqual(attrInt, 1),
Some(new Predicate(">=", Array(FieldReference(intColName), LiteralValue(1, IntegerType)))))
testTranslateFilter(GreaterThanOrEqual(1, attrInt),
Some(new Predicate("<=", Array(FieldReference(intColName), LiteralValue(1, IntegerType)))))

testTranslateFilter(LessThanOrEqual(attrInt, 1),
Some(new Predicate("<=", Array(FieldReference(intColName), LiteralValue(1, IntegerType)))))
testTranslateFilter(LessThanOrEqual(1, attrInt),
Some(new Predicate(">=", Array(FieldReference(intColName), LiteralValue(1, IntegerType)))))
}
}

test("SPARK-36644: Push down boolean column filter") {
testTranslateFilter($"col".boolean,
Some(new Predicate("=", Array(FieldReference("col"), LiteralValue(true, BooleanType)))))
Expand Down