julianhyde commented on code in PR #3382:
URL: https://github.com/apache/calcite/pull/3382#discussion_r1299615754
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core/src/main/java/org/apache/calcite/rel/metadata/RelMdMaxRowCount.java:
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@@ -104,6 +105,10 @@ public class RelMdMaxRowCount
return mq.getMaxRowCount(rel.getInput());
}
+ public @Nullable Double getMaxRowCount(Sample rel, RelMetadataQuery mq) {
+ return mq.getMaxRowCount(rel.getInput());
Review Comment:
Bernoulli sampling can, in the worst case, return all rows, or no rows.
Not sure about system sampling.
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