Github user Serhii-Harnyk commented on a diff in the pull request:
https://github.com/apache/drill/pull/793#discussion_r107647154
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/planner/cost/DrillRelMdRowCount.java
---
@@ -14,35 +14,71 @@
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
-
******************************************************************************/
+ */
package org.apache.drill.exec.planner.cost;
+import org.apache.calcite.rel.SingleRel;
import org.apache.calcite.rel.core.Aggregate;
import org.apache.calcite.rel.core.Filter;
+import org.apache.calcite.rel.core.Join;
+import org.apache.calcite.rel.core.Project;
+import org.apache.calcite.rel.core.Sort;
+import org.apache.calcite.rel.core.Union;
import org.apache.calcite.rel.metadata.ReflectiveRelMetadataProvider;
import org.apache.calcite.rel.metadata.RelMdRowCount;
import org.apache.calcite.rel.metadata.RelMetadataProvider;
+import org.apache.calcite.rel.metadata.RelMetadataQuery;
import org.apache.calcite.util.BuiltInMethod;
import org.apache.calcite.util.ImmutableBitSet;
+import org.apache.drill.exec.planner.common.DrillLimitRelBase;
public class DrillRelMdRowCount extends RelMdRowCount{
private static final DrillRelMdRowCount INSTANCE = new
DrillRelMdRowCount();
public static final RelMetadataProvider SOURCE =
ReflectiveRelMetadataProvider.reflectiveSource(BuiltInMethod.ROW_COUNT.method,
INSTANCE);
@Override
- public Double getRowCount(Aggregate rel) {
+ public Double getRowCount(Aggregate rel, RelMetadataQuery mq) {
ImmutableBitSet groupKey = ImmutableBitSet.range(rel.getGroupCount());
if (groupKey.isEmpty()) {
return 1.0;
} else {
- return super.getRowCount(rel);
+ return super.getRowCount(rel, mq);
}
}
@Override
- public Double getRowCount(Filter rel) {
- return rel.getRows();
+ public Double getRowCount(Filter rel, RelMetadataQuery mq) {
--- End diff --
In RelMdRowCount.java added overloaded methods, which returns other result
than getRowCount(RelNode rel, RelMetadataQuery mq) [1] as it was before.
So in order to preserve previous Drill behavior, I override those methods.
[1]
https://github.com/Serhii-Harnyk/incubator-calcite/blob/02848c99d75f2d0e00c219f3fa300fc8e7df26df/core/src/main/java/org/apache/calcite/rel/metadata/RelMdRowCount.java#L65
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