hsyuan commented on a change in pull request #1557: [CALCITE-3473] Getting
unique result for table scan should contain key column(s)
URL: https://github.com/apache/calcite/pull/1557#discussion_r352714299
##########
File path:
core/src/main/java/org/apache/calcite/rel/metadata/RelMdUniqueKeys.java
##########
@@ -226,6 +227,18 @@ private RelMdUniqueKeys() {}
return ImmutableSet.of();
}
+ public Set<ImmutableBitSet> getUniqueKeys(TableScan rel, RelMetadataQuery mq,
+ boolean ignoreNulls) {
+ final List<ImmutableBitSet> keys = rel.getTable().getKeys();
+ if (keys.isEmpty()) {
+ return null;
+ }
+ for (ImmutableBitSet key : keys) {
+ assert rel.getTable().isKey(key);
+ }
Review comment:
Do we really need L236~238?
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