Java conditional joins should not require matching column counts (#8955)

The Java conditional join APIs had a copy-n-paste error from the equality join code where it mandated the left and right table column counts matched.  Conditional joins use an AST expression for the join condition which does not require a 1-to-1 mapping between left and right table columns, so this check has been removed from the conditional join APIs.

Authors:
  - Jason Lowe (https://github.com/jlowe)

Approvers:
  - Robert (Bobby) Evans (https://github.com/revans2)

URL: #8955

java/src/main/java/ai/rapids/cudf/Table.java

@@ -2004,10 +2004,6 @@ public GatherMap[] leftJoinGatherMaps(Table rightKeys, boolean compareNullsEqual
    */
   public GatherMap[] leftJoinGatherMaps(Table rightTable, CompiledExpression condition,
                                         boolean compareNullsEqual) {
-    if (getNumberOfColumns() != rightTable.getNumberOfColumns()) {
-      throw new IllegalArgumentException("column count mismatch, this: " + getNumberOfColumns() +
-          "rightKeys: " + rightTable.getNumberOfColumns());
-    }
     long[] gatherMapData =
         conditionalLeftJoinGatherMaps(getNativeView(), rightTable.getNativeView(),
             condition.getNativeHandle(), compareNullsEqual);
@@ -2049,10 +2045,6 @@ public GatherMap[] innerJoinGatherMaps(Table rightKeys, boolean compareNullsEqua
    */
   public GatherMap[] innerJoinGatherMaps(Table rightTable, CompiledExpression condition,
                                          boolean compareNullsEqual) {
-    if (getNumberOfColumns() != rightTable.getNumberOfColumns()) {
-      throw new IllegalArgumentException("column count mismatch, this: " + getNumberOfColumns() +
-          "rightKeys: " + rightTable.getNumberOfColumns());
-    }
     long[] gatherMapData =
         conditionalInnerJoinGatherMaps(getNativeView(), rightTable.getNativeView(),
             condition.getNativeHandle(), compareNullsEqual);
@@ -2094,10 +2086,6 @@ public GatherMap[] fullJoinGatherMaps(Table rightKeys, boolean compareNullsEqual
    */
   public GatherMap[] fullJoinGatherMaps(Table rightTable, CompiledExpression condition,
                                          boolean compareNullsEqual) {
-    if (getNumberOfColumns() != rightTable.getNumberOfColumns()) {
-      throw new IllegalArgumentException("column count mismatch, this: " + getNumberOfColumns() +
-          "rightKeys: " + rightTable.getNumberOfColumns());
-    }
     long[] gatherMapData =
         conditionalFullJoinGatherMaps(getNativeView(), rightTable.getNativeView(),
             condition.getNativeHandle(), compareNullsEqual);
@@ -2146,10 +2134,6 @@ public GatherMap leftSemiJoinGatherMap(Table rightKeys, boolean compareNullsEqua
    */
   public GatherMap leftSemiJoinGatherMap(Table rightTable, CompiledExpression condition,
                                          boolean compareNullsEqual) {
-    if (getNumberOfColumns() != rightTable.getNumberOfColumns()) {
-      throw new IllegalArgumentException("column count mismatch, this: " + getNumberOfColumns() +
-          "rightKeys: " + rightTable.getNumberOfColumns());
-    }
     long[] gatherMapData =
         conditionalLeftSemiJoinGatherMap(getNativeView(), rightTable.getNativeView(),
             condition.getNativeHandle(), compareNullsEqual);
@@ -2191,10 +2175,6 @@ public GatherMap leftAntiJoinGatherMap(Table rightKeys, boolean compareNullsEqua
    */
   public GatherMap leftAntiJoinGatherMap(Table rightTable, CompiledExpression condition,
                                          boolean compareNullsEqual) {
-    if (getNumberOfColumns() != rightTable.getNumberOfColumns()) {
-      throw new IllegalArgumentException("column count mismatch, this: " + getNumberOfColumns() +
-          "rightKeys: " + rightTable.getNumberOfColumns());
-    }
     long[] gatherMapData =
         conditionalLeftAntiJoinGatherMap(getNativeView(), rightTable.getNativeView(),
             condition.getNativeHandle(), compareNullsEqual);

java/src/test/java/ai/rapids/cudf/TableTest.java

@@ -1496,7 +1496,9 @@ void testConditionalLeftJoinGatherMaps() {
         new ColumnReference(0, TableReference.LEFT),
         new ColumnReference(0, TableReference.RIGHT));
     try (Table left = new Table.TestBuilder().column(2, 3, 9, 0, 1, 7, 4, 6, 5, 8).build();
-         Table right = new Table.TestBuilder().column(6, 5, 9, 8, 10, 32).build();
+         Table right = new Table.TestBuilder()
+             .column(6, 5, 9, 8, 10, 32)
+             .column(0, 1, 2, 3, 4, 5).build();
          Table expected = new Table.TestBuilder()
              .column(  0,   1, 2, 2, 2,   3,   4, 5, 5,   6, 7,   8, 9, 9)
              .column(inv, inv, 0, 1, 3, inv, inv, 0, 1, inv, 1, inv, 0, 1)
@@ -1589,7 +1591,9 @@ void testConditionalInnerJoinGatherMaps() {
         new ColumnReference(0, TableReference.LEFT),
         new ColumnReference(0, TableReference.RIGHT));
     try (Table left = new Table.TestBuilder().column(2, 3, 9, 0, 1, 7, 4, 6, 5, 8).build();
-         Table right = new Table.TestBuilder().column(6, 5, 9, 8, 10, 32).build();
+         Table right = new Table.TestBuilder()
+             .column(6, 5, 9, 8, 10, 32)
+             .column(0, 1, 2, 3, 4, 5).build();
          Table expected = new Table.TestBuilder()
              .column(2, 2, 2, 5, 5, 7, 9, 9)
              .column(0, 1, 3, 0, 1, 1, 0, 1)
@@ -1684,7 +1688,9 @@ void testConditionalFullJoinGatherMaps() {
         new ColumnReference(0, TableReference.LEFT),
         new ColumnReference(0, TableReference.RIGHT));
     try (Table left = new Table.TestBuilder().column(2, 3, 9, 0, 1, 7, 4, 6, 5, 8).build();
-         Table right = new Table.TestBuilder().column(6, 5, 9, 8, 10, 32).build();
+         Table right = new Table.TestBuilder()
+             .column(6, 5, 9, 8, 10, 32)
+             .column(0, 1, 2, 3, 4, 5).build();
          Table expected = new Table.TestBuilder()
              .column(inv, inv, inv,   0,   1, 2, 2, 2,   3,   4, 5, 5,   6, 7,   8, 9, 9)
              .column(  2,   4,   5, inv, inv, 0, 1, 3, inv, inv, 0, 1, inv, 1, inv, 0, 1)
@@ -1763,7 +1769,9 @@ void testConditionalLeftSemiJoinGatherMap() {
         new ColumnReference(0, TableReference.LEFT),
         new ColumnReference(0, TableReference.RIGHT));
     try (Table left = new Table.TestBuilder().column(2, 3, 9, 0, 1, 7, 4, 6, 5, 8).build();
-         Table right = new Table.TestBuilder().column(6, 5, 9, 8, 10, 32).build();
+         Table right = new Table.TestBuilder()
+             .column(6, 5, 9, 8, 10, 32)
+             .column(0, 1, 2, 3, 4, 5).build();
          Table expected = new Table.TestBuilder()
              .column(2, 5, 7, 9) // left
              .build();
@@ -1827,7 +1835,9 @@ void testConditionalLeftAntiJoinGatherMap() {
         new ColumnReference(0, TableReference.LEFT),
         new ColumnReference(0, TableReference.RIGHT));
     try (Table left = new Table.TestBuilder().column(2, 3, 9, 0, 1, 7, 4, 6, 5, 8).build();
-         Table right = new Table.TestBuilder().column(6, 5, 9, 8, 10, 32).build();
+         Table right = new Table.TestBuilder()
+             .column(6, 5, 9, 8, 10, 32)
+             .column(0, 1, 2, 3, 4, 5).build();
          Table expected = new Table.TestBuilder()
              .column(0, 1, 3, 4, 6, 8) // left
              .build();