Itzdhruvpatel commented on issue #18913:
URL: https://github.com/apache/datafusion/issues/18913#issuecomment-3572195371
I appreciate you reporting this. The reason for the error is that
DataFusion's current implementation of the `MAP()` function expects both
arguments to be list types (list, large_list, or fixed_size_list) rather than
scalar strings (Utf8). Thus, a type mismatch causes the syntax `MAP('type',
'test')` to fail.
Workaround:
Use arrays to construct the map:
sql
SELECT MAP(ARRAY['type'], ARRAY['test']);
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