[fix](fe) Fix struct field slot type in NestedColumnPruning for OFFSET-only access#62446
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HappenLee merged 1 commit intoapache:masterfrom Apr 14, 2026
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…T-only access Issue Number: close #xxx Problem Summary: When using struct_element() to access a string field inside a struct (e.g., length(struct_element(struct_col, 'f3'))), the NestedColumnPruning rule incorrectly returned Optional.empty() for the slot type, causing the slot type to become nullable and lose its original type information. The fix changes the return value from Optional.empty() to Optional.of(type) when the column is accessed in OFFSET-only mode (e.g., length()), ensuring the slot type remains the original type (e.g., varchar). Release note: None Test: Added test case in string_length_column_pruning.groovy
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englefly
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Apr 13, 2026
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Problem Summary: When using struct_element() to access a string field inside a struct (e.g., length(struct_element(struct_col, 'f3'))), the NestedColumnPruning rule incorrectly returned Optional.empty() for the slot type, causing the slot type to become nullable and lose its original type information.
The fix changes the return value from Optional.empty() to Optional.of(type) when the column is accessed in OFFSET-only mode (e.g., length()), ensuring the slot type remains the original type (e.g., varchar).
Release note: None
Test: Added test case in string_length_column_pruning.groovy