alamb commented on PR #20117:
URL: https://github.com/apache/datafusion/pull/20117#issuecomment-3843241718
BTW codex found a test that shows a single projection being extracted
doesn't get pushed down
I can make this a separate PR if you like
```sql
###
# Test 2.1b: Projection-only get_field (potential optimization target)
###
query TT
EXPLAIN SELECT s['label'] FROM simple_struct;
----
logical_plan
01)Projection: get_field(simple_struct.s, Utf8("label"))
02)--TableScan: simple_struct projection=[s]
physical_plan DataSourceExec: file_groups={1 group:
[[WORKSPACE_ROOT/datafusion/sqllogictest/test_files/scratch/projection_pushdown/simple.parquet]]},
projection=[get_field(s@1, label) as simple_struct.s[label]], file_type=parquet
# Verify correctness
query T
SELECT s['label'] FROM simple_struct ORDER BY s['label'];
----
alpha
beta
delta
epsilon
gamma
```
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
To unsubscribe, e-mail: [email protected]
For queries about this service, please contact Infrastructure at:
[email protected]
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
