Spark SQL 之 Antlr grammar 具体分析

src/main/antlr4/org/apache/spark/sql/catalyst/parser/SqlBaseLexer.g4

BACKQUOTED_IDENTIFIER: '`' ( ~'`' | '``' )* '`';

src/main/antlr4/org/apache/spark/sql/catalyst/parser/SqlBaseParser.g4

queryPrimary: