Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/10723#discussion_r50361041
--- Diff:
sql/catalyst/src/main/antlr3/org/apache/spark/sql/catalyst/parser/SparkSqlParser.g
---
@@ -2115,7 +2185,7 @@ structType
mapType
@init { pushMsg("map type", state); }
@after { popMsg(state); }
- : KW_MAP LESSTHAN left=primitiveType COMMA right=type GREATERTHAN
+ : KW_MAP LESSTHAN left=type COMMA right=type GREATERTHAN
--- End diff --
Key in Map can be any type.
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