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[fix](fe) Fix struct field slot type in NestedColumnPruning for OFFSET-only access #62446

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Merged
HappenLee merged 1 commit into from
Apr 14, 2026
Merged

[fix](fe) Fix struct field slot type in NestedColumnPruning for OFFSET-only access #62446

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3 changes: 1 addition & 2 deletions fe/fe-core/src/main/java/org/apache/doris/nereids/rules/rewrite/NestedColumnPruning.java
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Original file line number Diff line number Diff line change
Expand Up @@ -666,8 +666,7 @@ public Optional<DataType> pruneDataType() {
return Optional.of(type);
} else if (isStringOffsetOnly) {
// Only the offset array is accessed (e.g. length(str_col)).
// The slot type stays unchanged (varchar); the access path tells BE to skip char data.
return Optional.empty();
return Optional.of(type);
} else if (!accessPartialChild) {
return Optional.empty();
}
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2 changes: 1 addition & 1 deletion regression-test/suites/nereids_rules_p0/column_pruning/string_length_column_pruning.groovy
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Expand Up @@ -69,7 +69,7 @@ suite("string_length_column_pruning") {
contains "OFFSET"
notContains "type=bigint"
}
//sql "select length(struct_element(struct_col, 'f3')) from slcp_str_tbl"
sql "select length(struct_element(struct_col, 'f3')) from slcp_str_tbl"
// length() in both SELECT and WHERE: predicate must remain length(str_col) > 1,
// never be rewritten to CAST(str_col AS int) > 1. Slot type must stay varchar.
explain {
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