amaliujia commented on a change in pull request #12073:
URL: https://github.com/apache/beam/pull/12073#discussion_r445147153
##########
File path:
sdks/java/extensions/sql/src/main/java/org/apache/beam/sdk/extensions/sql/impl/rel/BeamMatchRel.java
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@@ -0,0 +1,279 @@
+package org.apache.beam.sdk.extensions.sql.impl.rel;
+
+import org.apache.beam.sdk.extensions.sql.impl.SqlConversionException;
+import org.apache.beam.sdk.extensions.sql.impl.planner.BeamCostModel;
+import org.apache.beam.sdk.extensions.sql.impl.planner.NodeStats;
+import org.apache.beam.sdk.schemas.Schema;
+import org.apache.beam.sdk.transforms.Combine;
+import org.apache.beam.sdk.transforms.DoFn;
+import org.apache.beam.sdk.transforms.PTransform;
+import org.apache.beam.sdk.transforms.ParDo;
+import org.apache.beam.sdk.values.KV;
+import org.apache.beam.sdk.values.PCollection;
+import org.apache.beam.sdk.values.PCollectionList;
+import org.apache.beam.sdk.values.Row;
+import
org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.plan.RelOptCluster;
+import
org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.plan.RelOptPlanner;
+import
org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.plan.RelTraitSet;
+import
org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.rel.RelCollation;
+import
org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.rel.RelFieldCollation;
+import org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.rel.RelNode;
+import
org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.rel.core.Match;
+import
org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.rel.metadata.RelMetadataQuery;
+import
org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.rel.type.RelDataType;
+import org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.rex.RexNode;
+import
org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.rex.RexVariable;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.sql.Array;
+import java.util.*;
Review comment:
Same. Import class by class.
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