comphead commented on code in PR #20143:
URL: https://github.com/apache/datafusion/pull/20143#discussion_r2764647702
##########
datafusion/sqllogictest/test_files/projection_pushdown.slt:
##########
@@ -118,6 +118,24 @@ SELECT id, s['value'] FROM simple_struct ORDER BY id;
4 300
5 250
+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
Review Comment:
so `projection=[get_field(s@1, label)` means the we extract label field from
`s` structure column as earlier as possible, on the scan level?
##########
datafusion/sqllogictest/test_files/projection_pushdown.slt:
##########
@@ -118,6 +118,24 @@ SELECT id, s['value'] FROM simple_struct ORDER BY id;
4 300
5 250
+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
Review Comment:
so `projection=[get_field(s@1, label)` means the we extract `label` field
from `s` structure column as earlier as possible, on the scan level?
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