[enhance](struct) Merge struct_element into element_at#64027
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FE UT Coverage ReportIncrement line coverage |
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TPC-H: Total hot run time: 29274 ms |
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TPC-DS: Total hot run time: 169828 ms |
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| // visitUnboundFunction where the named call `element_at(s,'f')` gets this same rewrite. Apply the | ||
| // shared ElementAt.rewriteWhenAnalyze() here so both syntaxes behave identically; otherwise the | ||
| // BE receives element_at(struct) and aborts. | ||
| if (coerced instanceof RewriteWhenAnalyze) { |
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maybe we need merge element_at and struct_element into one function
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Subscript access on a struct, s['field'], is parsed directly into an element_at expression, but element_at only supported ARRAY and MAP and aborted on a DCHECK in the BE (DORIS-26105). Rather than routing struct field access through a separate struct_element function, make element_at the single entry point for array/map/struct field access. BE: FunctionArrayElement (element_at) now resolves a struct field by its constant int/string index and the standalone struct_element function is removed. The struct_element name is registered as a plain extra name on the same implementation (not an alias: element_at is in the variadic set because FunctionVariantElement shares the name, so an alias key would be mangled to element_atStructString and fail to resolve), keeping any persisted plan that still references struct_element resolvable. FE: the StructElement node is removed and every struct field access form (s['f'], s.f, element_at(s,'f'), struct_element(s,'f')) converges on ElementAt, which absorbs the struct signature, legality check, int->name normalization and the nested-column-pruning access path. struct_element remains a user-facing SQL name bound to ElementAt. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Projecting a struct field by its original mixed-case name (e.g. reading a migrated Iceberg table whose schema keeps sName while Doris stores it as sname, then querying sName) failed with an opaque error: [INTERNAL_ERROR] function return type check failed ... real_return_type is nullptr. Root cause: struct field names are canonically lower-cased by the FE (both native DDL and the Iceberg schema read go through StructField.toLowerCase), but a query may reference a field with different casing. The FE matches the field case-insensitively and forwards the original-case name to the BE, while DataTypeStruct::try_get_position_by_name compared case-sensitively, so the field was not found, get_return_type returned nullptr and build() reported the opaque internal error. Fix: - DataTypeStruct::try_get_position_by_name / get_position_by_name match the field name case-insensitively (iequal). - element_at's struct return-type path throws the concrete "field not found / index out of bound" error instead of returning nullptr, so an unresolvable field surfaces a clear message rather than an internal error. DORIS-26117 Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Reflect apache/doris#64027 latest changes: struct_element is now subsumed by element_at (kept as a backward-compatible alias), struct field names are matched case-insensitively, document the dot operator s.field access form, and update the non-constant index error message. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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doc: apache/doris-website#3898 element_at access for STRUCT type
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