akoshchiy commented on code in PR #16790:
URL: https://github.com/apache/datafusion/pull/16790#discussion_r2210860376
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datafusion/sqllogictest/test_files/push_down_filter.slt:
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@@ -128,12 +128,31 @@ physical_plan
06)----------ProjectionExec: expr=[column1@0 as column1, column2@1 as
__unnest_placeholder(d.column2)]
07)------------DataSourceExec: partitions=1, partition_sizes=[1]
+statement ok
+drop table d;
+statement ok
+CREATE TABLE d AS VALUES (named_struct('a', 1, 'b', 2)), (named_struct('a', 3,
'b', 4)), (named_struct('a', 5, 'b', 6));
+
+query II
+select * from (select unnest(column1) from d) where
"__unnest_placeholder(d.column1).b" > 5;
Review Comment:
As I can see, it's a result of struct unnest preprocessing in
`SqlToRel::try_process_unnest`. `unnest(struct_col)` will be transformed into
`__unnest_placeholder(struct_col).field1, unnest(struct_col).field2` etc.
To be honest, I'm not sure, that it was supposed to be like that or not.
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