xuzifu666 commented on code in PR #5274:
URL: https://github.com/apache/calcite/pull/5274#discussion_r4194834644
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core/src/main/java/org/apache/calcite/tools/RelBuilder.java:
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@@ -195,7 +199,45 @@
public class RelBuilder {
protected final RelOptCluster cluster;
protected final @Nullable RelOptSchema relOptSchema;
- private final Deque<Frame> stack = new ArrayDeque<>();
+ /** Stack of relational expressions that are being built.
+ *
Review Comment:
Done, the anonymous class is now a named inner class, `FrameStack`, placed
at the end of the file next to `Frame`. The check still happens in `offer()`,
which `push()` delegates to.
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