cloud-fan commented on code in PR #51190:
URL: https://github.com/apache/spark/pull/51190#discussion_r2168131476
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sql/api/src/main/antlr4/org/apache/spark/sql/catalyst/parser/SqlBaseParser.g4:
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@@ -1230,6 +1231,35 @@ primaryExpression
FROM position=valueExpression (FOR length=valueExpression)? RIGHT_PAREN
#overlay
;
+semiStructuredExtractionPath
+ : jsonPathFirstPart (jsonPathParts)*
+ ;
+
+jsonPathIdentifier
+ : identifier
+ | BACKQUOTED_IDENTIFIER
+ ;
+
+jsonPathBracketedIdentifier
+ : LEFT_BRACKET stringLit RIGHT_BRACKET
+ ;
+
+jsonPathFirstPart
+ : jsonPathIdentifier
+ | jsonPathBracketedIdentifier
+ | DOT
+ | LEFT_BRACKET INTEGER_VALUE RIGHT_BRACKET
+ | LEFT_BRACKET ASTERISK RIGHT_BRACKET
+ ;
+
+jsonPathParts
+ : DOT jsonPathIdentifier
+ | jsonPathBracketedIdentifier
+ | LEFT_BRACKET INTEGER_VALUE RIGHT_BRACKET
+ | LEFT_BRACKET ASTERISK RIGHT_BRACKET
+ | LEFT_BRACKET identifier RIGHT_BRACKET
Review Comment:
can we test these two syntaxes? `field['string']` and `field[*]`.
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