compileJavacc emits JavaCC warnings for shadowed literals and unreachable DATA_TYPE branches #2403

Warning: RR cannot be matched as a string literal token. It will be matched as the non string literal token of kind 149.
Warning: RS cannot be matched as a string literal token. It will be matched as the non string literal token of kind 149.
Warning: TEXT cannot be matched as a string literal token. It will be matched as the non string literal token of kind 407.
Warning: TIMESTAMPTZ cannot be matched as a string literal token. It will be matched as the non string literal token of kind 92.
Warning: TIMEZONE cannot be matched as a string literal token. It will be matched as the non string literal token of kind 522.
Warning: TINYTEXT cannot be matched as a string literal token. It will be matched as the non string literal token of kind 407.
Warning: UR cannot be matched as a string literal token. It will be matched as the non string literal token of kind 149.
Warning: MATCHING cannot be matched as a string literal token. It will be matched as the non string literal token of kind 522.
Warning: DISTRIBUTED cannot be matched as a string literal token. It will be matched as the non string literal token of kind 522.
Warning: RECOVERY cannot be matched as a string literal token. It will be matched as the non string literal token of kind 522.
Warning: Line 748, Column 5: Regular Expression choice : K_BYTES can never be matched as : DATA_TYPE
Warning: Line 748, Column 5: Regular Expression choice : K_BINARY can never be matched as : DATA_TYPE
Warning: Line 748, Column 5: Regular Expression choice : K_BOOLEAN can never be matched as : DATA_TYPE
Warning: Line 748, Column 5: Regular Expression choice : K_UNSIGNED can never be matched as : DATA_TYPE
Warning: Line 748, Column 5: Regular Expression choice : K_SIGNED can never be matched as : DATA_TYPE
Warning: Line 748, Column 5: Regular Expression choice : K_CHARACTER can never be matched as : DATA_TYPE
Warning: Line 748, Column 5: Regular Expression choice : K_CHAR can never be matched as : DATA_TYPE