jinxing64 commented on a change in pull request #1936:
URL: https://github.com/apache/calcite/pull/1936#discussion_r412899044
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File path:
core/src/main/java/org/apache/calcite/plan/RelOptMaterializations.java
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@@ -223,6 +228,19 @@
return new SubstitutionVisitor(target, root).go(materialization.tableRel);
}
+ /**
+ * trim unused fields in relational expressions.
+ */
+ private static RelNode trimUnusedfields(RelNode relNode) {
+ final List<RelOptTable> relOptTables = RelOptUtil.findAllTables(relNode);
Review comment:
When no `TableScan`, shall we use `null` to construct a `RelBuilder` and
do the trimming ?
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