suibianwanwank commented on PR #4354:
URL: https://github.com/apache/calcite/pull/4354#issuecomment-2849318576
I seem to have some misunderstanding here. According to the documentation
below, the default value of `isExpand` should be `false`, and when `expand` is
`true`, certain issues may not necessarily be maintained. However, in
`SqlToRelConverter`, the default value of `expand` appears to be `true`, which
is causing me some confusion.
```
/** Returns the {@code expand} option. Controls whether to expand
* sub-queries. If false (the default), each sub-query becomes a
* {@link org.apache.calcite.rex.RexSubQuery}.
*
* <p>Setting {@code expand} to true is deprecated. Expansion still
works,
* but there will be less development effort in that area. */
@Value.Default default boolean isExpand() {
return false;
}
```
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