Milinda Lakmal Pathirage created CALCITE-783:
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Summary: Project's collation infering logic doesn't handle
monotonic expressions
Key: CALCITE-783
URL: https://issues.apache.org/jira/browse/CALCITE-783
Project: Calcite
Issue Type: Bug
Components: core
Reporter: Milinda Lakmal Pathirage
Assignee: Julian Hyde
Current implementation of RelMdCollation#project doesn't handle function
expressions and because of that we loose any collation metadata related to
monotonic expressions which can be useful generating streaming query execution
plans involving tumbling windows.
Following is how current code looks like (RelMdCollation):
185: for (Ord<RexNode> project : Ord.zip(projects)) {
186: if (project.e instanceof RexInputRef) {
187: targets.put(((RexInputRef) project.e).getIndex(), project.i);
188: }
189: }
We only handle projects of type RexInputRef. But to support monotonic
expressions we should laso handle projects of type RexCall.
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