TRANSFORM_KEYS (Lakehouse v2)

Applies a lambda expression to transform the keys of a map.

Analyze Syntax

func.transform_keys(get_column(table, 'map_col'), lambda k, v: upper(k))

Analyze Examples

func.transform_keys(MAP{'a':1,'b':2}, lambda k,v: upper(k))

┌───────────────┐
│ {'A':1,'B':2} │
└───────────────┘

SQL Syntax

TRANSFORM_KEYS(<map_col>, lambda k, v: upper(k))

SQL Examples

SELECT TRANSFORM_KEYS((k, v) -> UPPER(k), MAP{'a':1, 'b':2});

┌───────────────┐
│ {"A":1,"B":2} │
└───────────────┘