Rich-T-kid commented on code in PR #24227:
URL: https://github.com/apache/datafusion/pull/24227#discussion_r3750916670
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datafusion/datasource-parquet/src/opener/mod.rs:
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@@ -985,6 +992,91 @@ impl MetadataLoadedParquetOpen {
metadata_dirty = true;
}
+ // Detect dictionary-encoded string/binary columns and rewrite their
Arrow types
+ // to Dictionary(Int32, ...) so the parquet reader produces dictionary
arrays.
+ // All three schemas are updated together so the reader, expr-adapter,
and
+ // downstream operators all agree on the output type.
+ if prepared.enable_rle_to_dictionary {
Review Comment:
All three schemas are updated together so the reader, expr-adapter, and
downstream operators all agree on the output type.
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