xiedeyantu commented on code in PR #4540:
URL: https://github.com/apache/calcite/pull/4540#discussion_r2384403302
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core/src/main/java/org/apache/calcite/rel/metadata/RelMdFunctionalDependency.java:
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@@ -20,33 +20,47 @@
import org.apache.calcite.plan.RelOptUtil;
import org.apache.calcite.rel.RelNode;
import org.apache.calcite.rel.core.Aggregate;
-import org.apache.calcite.rel.core.AggregateCall;
import org.apache.calcite.rel.core.Calc;
import org.apache.calcite.rel.core.Correlate;
+import org.apache.calcite.rel.core.Filter;
import org.apache.calcite.rel.core.Join;
+import org.apache.calcite.rel.core.JoinRelType;
import org.apache.calcite.rel.core.Project;
import org.apache.calcite.rel.core.SetOp;
import org.apache.calcite.rel.core.TableScan;
import org.apache.calcite.rex.RexCall;
import org.apache.calcite.rex.RexInputRef;
+import org.apache.calcite.rex.RexLiteral;
import org.apache.calcite.rex.RexNode;
-import org.apache.calcite.rex.RexProgram;
import org.apache.calcite.rex.RexUtil;
+import org.apache.calcite.sql.SqlKind;
import org.apache.calcite.util.ImmutableBitSet;
+import org.apache.calcite.util.mapping.Mappings;
import org.checkerframework.checker.nullness.qual.Nullable;
+import java.util.HashMap;
import java.util.List;
+import java.util.Map;
+import java.util.Set;
/**
- * Default implementation of
- * {@link RelMetadataQuery#determines(RelNode, int, int)}
+ * Default implementation of {@link BuiltInMetadata.FunctionalDependency}
metadata handler
Review Comment:
> I think that splitting it into 2 won't be that much work since you have
the code ready. I would probably first file an issue for the algebraic part,
submit that, then keep only the metadata part in this PR which would be
rebased. I should have probably suggested this earlier.
Yes, splitting it into two PRs is quite feasible at this point. I think your
suggestion comes at just the right time. Any earlier, and I wouldn’t have been
certain about which specific methods needed to be implemented in the functional
dependency algorithm. Both parts required careful consideration from my side.
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