godfreyhe commented on a change in pull request #7903:
[FLINK-11822][table-planner-blink] Introduce Flink metadata handlers
URL: https://github.com/apache/flink/pull/7903#discussion_r278492953
##########
File path:
flink-table/flink-table-planner-blink/src/main/scala/org/apache/flink/table/plan/util/FlinkRelMdUtil.scala
##########
@@ -18,30 +18,326 @@
package org.apache.flink.table.plan.util
+import org.apache.flink.table.JDouble
import org.apache.flink.table.calcite.FlinkTypeFactory
import org.apache.flink.table.dataformat.BinaryRow
+import org.apache.flink.table.plan.nodes.calcite.{Expand, Rank}
+import
org.apache.flink.table.plan.nodes.physical.batch.BatchExecGroupAggregateBase
import org.apache.flink.table.runtime.rank.{ConstantRankRange, RankRange}
import org.apache.flink.table.runtime.sort.BinaryIndexedSortable
import org.apache.flink.table.typeutils.BinaryRowSerializer
-import org.apache.calcite.rel.RelNode
-import org.apache.calcite.rel.metadata.RelMetadataQuery
+import com.google.common.collect.ImmutableList
+import org.apache.calcite.avatica.util.TimeUnitRange._
+import org.apache.calcite.plan.RelOptUtil
+import org.apache.calcite.rel.core.{Aggregate, AggregateCall, Calc, JoinInfo,
SemiJoin}
+import org.apache.calcite.rel.metadata.{RelMdUtil, RelMetadataQuery}
+import org.apache.calcite.rel.{RelNode, SingleRel}
+import org.apache.calcite.rex.{RexBuilder, RexCall, RexInputRef, RexLiteral,
RexNode, RexUtil, RexVisitorImpl}
+import org.apache.calcite.sql.SqlKind
+import org.apache.calcite.sql.`type`.SqlTypeName.{TIME, TIMESTAMP}
+import org.apache.calcite.util.{ImmutableBitSet, NumberUtil}
-import java.lang.Double
+import java.math.BigDecimal
+import java.util
import scala.collection.JavaConversions._
+import scala.collection.mutable
/**
* FlinkRelMdUtil provides utility methods used by the metadata provider
methods.
*/
object FlinkRelMdUtil {
Review comment:
`FlinkRelMdUtil` provides utility methods(which are not defined in Calcite
`RelMdUtil`) used by the metadata provider methods. (`Md` means metadata)
`FlinkRelOptUtil` provides utility methods (which are not defined in Calcite
`RelOptUtil`) for use in optimizing RelNodes.
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