rdblue commented on a change in pull request #1906:
URL: https://github.com/apache/iceberg/pull/1906#discussion_r540562816



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File path: 
spark3-extensions/src/main/antlr/org.apache.spark.sql.catalyst.parser.extensions/IcebergSqlExtensions.g4
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@@ -76,6 +76,7 @@ callArgument
 
 expression
     : constant
+    | stringMap

Review comment:
       Actually, we may want to remove `keyValue` and just use `constant` so 
that a missing value doesn't result in a parse error. Instead we can give a 
better error message in the AST builder.




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