Module complex_type_udf

Expand description

Array, Struct, and Map scalar UDFs (F-SCHEMA-015) Array, Struct, and Map scalar UDFs (F-SCHEMA-015).

Tier 1 — Built-in DataFusion array functions are verified via tests.

Tier 2 — Custom scalar UDFs for struct/map operations:

Function	Signature	Return
`struct_extract(struct, field)`	Struct, Utf8	field type
`struct_set(struct, field, value)`	Struct, Utf8, Any	Struct
`struct_drop(struct, field)`	Struct, Utf8	Struct
`struct_rename(struct, old, new)`	Struct, Utf8, Utf8	Struct
`struct_merge(s1, s2)`	Struct, Struct	Struct
`map_keys(map)`	Map	List<K>
`map_values(map)`	Map	List<V>
`map_contains_key(map, key)`	Map, K	Boolean
`map_from_arrays(keys, vals)`	List, List	Map

Structs§

MapContainsKey: map_contains_key(map, key) — check if a map contains a given key.
MapFromArrays: map_from_arrays(keys, values) — construct a map from key/value arrays.
MapKeys: map_keys(map) — extract keys from a map as a list.
MapValues: map_values(map) — extract values from a map as a list.
StructDrop: struct_drop(struct, field_name) — remove a field from a struct.
StructExtract: struct_extract(struct, field_name) — extract a field from a struct column.
StructMerge: struct_merge(s1, s2) — merge two structs (s2 fields override s1).
StructRename: struct_rename(struct, old_name, new_name) — rename a struct field.
StructSet: struct_set(struct, field_name, value) — set/add a field in a struct.

register_complex_type_functions: Registers all complex type UDFs with the given session context.