helloppx commented on a change in pull request #1680: [CALCITE-3621] Push down
sort to DB, SQL of Sort rel contains explicit field name instead of * when sort
is not top rel
URL: https://github.com/apache/calcite/pull/1680#discussion_r361360850
##########
File path:
core/src/main/java/org/apache/calcite/rel/rel2sql/RelToSqlConverter.java
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@@ -634,6 +634,13 @@ public Result visit(Sort e) {
}
Result x = visitChild(0, e.getInput());
Builder builder = x.builder(e, Clause.ORDER_BY);
+ if (builder.select.getSelectList() == null) {
Review comment:
I have updated the description of regission issue again, please help review
:D
`if (stack.getLast().r != e)` can make a decision whether currently Sort rel
is the outermost rel.
If it is, the select list of generated SQL can be "select *", It is more
simplier.
If not, the select list of generated SQL shoud contain explicit column name.
Yes, `CalcitePrepareImpl#implement(RelRoot root)` generate SQL by
`root.rel`，but the final select field be controled by `root.fields`.
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