[SPARK-4468][SQL] Fixes Parquet filter creation for inequality predicates with literals on the left hand side

For expressions like `10 < someVar`, we should create an `Operators.Gt` filter, but right now an `Operators.Lt` is created. This issue affects all inequality predicates with literals on the left hand side.

(This bug existed before #3317 and affects branch-1.1. #3338 was opened to backport this to branch-1.1.)

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Author: Cheng Lian <lian@databricks.com>

Closes #3334 from liancheng/fix-parquet-comp-filter and squashes the following commits:

0130897 [Cheng Lian] Fixes Parquet comparison filter generation

2 files changed, 16 insertions, 4 deletions

diff --git a/sql/core/src/main/scala/org/apache/spark/sql/parquet/ParquetFilters.scala b/sql/core/src/main/scala/org/apache/spark/sql/parquet/ParquetFilters.scala
index 3a9e1499e2..6fb5f49b13 100644
--- a/sql/core/src/main/scala/org/apache/spark/sql/parquet/ParquetFilters.scala
+++ b/sql/core/src/main/scala/org/apache/spark/sql/parquet/ParquetFilters.scala
@@ -135,22 +135,22 @@ private[sql] object ParquetFilters {
       case LessThan(NamedExpression(name, _), Literal(value, dataType)) =>
         makeLt.lift(dataType).map(_(name, value))
       case LessThan(Literal(value, dataType), NamedExpression(name, _)) =>
-        makeLt.lift(dataType).map(_(name, value))
+        makeGt.lift(dataType).map(_(name, value))
 
       case LessThanOrEqual(NamedExpression(name, _), Literal(value, dataType)) =>
         makeLtEq.lift(dataType).map(_(name, value))
       case LessThanOrEqual(Literal(value, dataType), NamedExpression(name, _)) =>
-        makeLtEq.lift(dataType).map(_(name, value))
+        makeGtEq.lift(dataType).map(_(name, value))
 
       case GreaterThan(NamedExpression(name, _), Literal(value, dataType)) =>
         makeGt.lift(dataType).map(_(name, value))
       case GreaterThan(Literal(value, dataType), NamedExpression(name, _)) =>
-        makeGt.lift(dataType).map(_(name, value))
+        makeLt.lift(dataType).map(_(name, value))
 
       case GreaterThanOrEqual(NamedExpression(name, _), Literal(value, dataType)) =>
         makeGtEq.lift(dataType).map(_(name, value))
       case GreaterThanOrEqual(Literal(value, dataType), NamedExpression(name, _)) =>
-        makeGtEq.lift(dataType).map(_(name, value))
+        makeLtEq.lift(dataType).map(_(name, value))
 
       case And(lhs, rhs) =>
         (createFilter(lhs) ++ createFilter(rhs)).reduceOption(FilterApi.and)
diff --git a/sql/core/src/test/scala/org/apache/spark/sql/parquet/ParquetQuerySuite.scala b/sql/core/src/test/scala/org/apache/spark/sql/parquet/ParquetQuerySuite.scala
index d31a9d8418..7ee4f3c1e9 100644
--- a/sql/core/src/test/scala/org/apache/spark/sql/parquet/ParquetQuerySuite.scala
+++ b/sql/core/src/test/scala/org/apache/spark/sql/parquet/ParquetQuerySuite.scala
@@ -461,9 +461,21 @@ class ParquetQuerySuite extends QueryTest with FunSuiteLike with BeforeAndAfterA
     }
 
     checkFilter[Operators.Eq[Integer]]('a.int === 1)
+    checkFilter[Operators.Eq[Integer]](Literal(1) === 'a.int)
+
     checkFilter[Operators.Lt[Integer]]('a.int < 4)
+    checkFilter[Operators.Lt[Integer]](Literal(4) > 'a.int)
+    checkFilter[Operators.LtEq[Integer]]('a.int <= 4)
+    checkFilter[Operators.LtEq[Integer]](Literal(4) >= 'a.int)
+
+    checkFilter[Operators.Gt[Integer]]('a.int > 4)
+    checkFilter[Operators.Gt[Integer]](Literal(4) < 'a.int)
+    checkFilter[Operators.GtEq[Integer]]('a.int >= 4)
+    checkFilter[Operators.GtEq[Integer]](Literal(4) <= 'a.int)
+
     checkFilter[Operators.And]('a.int === 1 && 'a.int < 4)
     checkFilter[Operators.Or]('a.int === 1 || 'a.int < 4)
+    checkFilter[Operators.Not](!('a.int === 1))
 
     checkFilter('a.int > 'b.int, defined = false)
     checkFilter(('a.int > 'b.int) && ('a.int > 'b.int), defined = false)