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I would like to upgrade the parser in Coral Hive to Hive3. I have observed that the ParseTreeBuilder converts the AST nodes generated by Hive's ANTLR3 parsing into Calcite's SqlNode. On what rules is the visit method in ParseTreeBuilder based? How do we ensure that no SQL parsing or transformation is missed? Since ParseTreeBuilder has not implemented visit methods for all types of tokens in the Hive grammar file, how does the code determine which visit methods need to be implemented?
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Dear community developers,
I would like to upgrade the parser in Coral Hive to Hive3. I have observed that the
ParseTreeBuilderconverts the AST nodes generated by Hive's ANTLR3 parsing into Calcite'sSqlNode. On what rules is thevisitmethod inParseTreeBuilderbased? How do we ensure that no SQL parsing or transformation is missed? SinceParseTreeBuilderhas not implemented visit methods for all types of tokens in the Hive grammar file, how does the code determine which visit methods need to be implemented?Thank you in advance for your guidance!
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