adriangb commented on code in PR #16790:
URL: https://github.com/apache/datafusion/pull/16790#discussion_r2210812065
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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:
@akoshchiy is there documentation anywhere on what "__unnest_placeholder"
is? Is it a private implementation detail we are using to test, or something
that users could / should use in their queries?
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