yeshengm commented on a change in pull request #24809: [SPARK-21136][SQL] Fix
confusing parsing error due to problematic antlr grammer for Hive-style
single-from statements
URL: https://github.com/apache/spark/pull/24809#discussion_r291373165
##########
File path:
sql/catalyst/src/main/antlr4/org/apache/spark/sql/catalyst/parser/SqlBase.g4
##########
@@ -420,25 +416,58 @@ sortItem
: expression ordering=(ASC | DESC)? (NULLS nullOrder=(LAST | FIRST))?
;
+fromStatement
+ : fromClause fromStatementBody+
+ ;
+
+fromStatementBody
+ : transformClause
+ whereClause?
+ queryOrganization
+ | selectClause
+ lateralView*
+ whereClause?
+ aggregationClause?
+ havingClause?
+ windowClause?
+ queryOrganization
+ ;
+
querySpecification
- : (((SELECT kind=TRANSFORM '(' namedExpressionSeq ')'
- | kind=MAP namedExpressionSeq
- | kind=REDUCE namedExpressionSeq))
- inRowFormat=rowFormat?
- (RECORDWRITER recordWriter=STRING)?
- USING script=STRING
- (AS (identifierSeq | colTypeList | ('(' (identifierSeq | colTypeList)
')')))?
- outRowFormat=rowFormat?
- (RECORDREADER recordReader=STRING)?
- fromClause?
- (WHERE where=booleanExpression)?)
- | ((kind=SELECT (hints+=hint)* setQuantifier? namedExpressionSeq
fromClause?
- | fromClause (kind=SELECT setQuantifier? namedExpressionSeq)?)
- lateralView*
- (WHERE where=booleanExpression)?
- aggregation?
- (HAVING having=booleanExpression)?
- windows?)
+ : transformClause
Review comment:
Re-write `querySpecification` to show the fact that transform and select are
two different kinds of queries.
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