sio/parquetio: fix projection pushdown lists and maps - #7241
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Projection pushdown fails for lists and maps because columnIndexes returns nothing for columns with nested logical types (LIST and MAP). It does that because it looks up columns via parquet/schema.Schema.ColumnIndexByName, which exposes the structuring fields not present in the data (i.e., list and element for LIST; map, key, and value for MAP). Fix this by finding column indexes via pqarrow.SchemaManifest, which does not include those fields.
mattnibs
approved these changes
Aug 25, 2026
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Projection pushdown fails for lists and maps because columnIndexes returns nothing for columns with nested logical types (LIST and MAP). It does that because it looks up columns via
parquet/schema.Schema.ColumnIndexByName, which exposes the structuring fields not present in the data (i.e., list and element for LIST; map, key, and value for MAP). Fix this by finding column indexes via pqarrow.SchemaManifest, which does not include those fields.
Fixes #7220.