caicancai commented on code in PR #4865:
URL: https://github.com/apache/calcite/pull/4865#discussion_r3037129475
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core/src/main/java/org/apache/calcite/sql2rel/RelFieldTrimmer.java:
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@@ -533,6 +535,8 @@ public TrimResult trimFields(
Project project,
ImmutableBitSet fieldsUsed,
Set<RelDataTypeField> extraFields) {
+ checkArgument(project.getVariablesSet().size() <= 1,
Review Comment:
Perhaps including the actual size in the error message would make
troubleshooting easier.
##########
core/src/main/java/org/apache/calcite/sql2rel/RelFieldTrimmer.java:
##########
@@ -533,6 +535,8 @@ public TrimResult trimFields(
Project project,
ImmutableBitSet fieldsUsed,
Set<RelDataTypeField> extraFields) {
+ checkArgument(project.getVariablesSet().size() <= 1,
Review Comment:
I feel that making a judgment at the beginning is not a good choice.
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