arungopalan commented on issue #18078:
URL:
https://github.com/apache/shardingsphere/issues/18078#issuecomment-1141545395
See code below that can reproduce this. This produces no error but it should.
```
package com.somepackage;
import org.antlr.v4.runtime.CharStreams;
import org.antlr.v4.runtime.CommonTokenStream;
import org.antlr.v4.runtime.ParserRuleContext;
import org.antlr.v4.runtime.tree.ErrorNode;
import org.antlr.v4.runtime.tree.ParseTreeListener;
import org.antlr.v4.runtime.tree.ParseTreeWalker;
import org.antlr.v4.runtime.tree.TerminalNode;
import
org.apache.shardingsphere.sql.parser.postgresql.parser.PostgreSQLLexer;
import
org.apache.shardingsphere.sql.parser.postgresql.parser.PostgreSQLParser;
/**
* Hello world!
*
*/
public class App
{
public static void main( String[] args )
{
String query = "select * as ab from some_table";
PostgreSQLLexer postgreSQLLexer = new
PostgreSQLLexer(CharStreams.fromString(query));
PostgreSQLParser postgreSQLParser = new PostgreSQLParser(new
CommonTokenStream(postgreSQLLexer));
ParseTreeWalker parseTreeWalker = new ParseTreeWalker();
parseTreeWalker.walk(new ParseTreeListener() {
@Override
public void visitTerminal(TerminalNode node) {
System.out.println("Terminal [" + node.getText() + "]");
}
@Override
public void visitErrorNode(ErrorNode node) {
System.out.println("Error [" + node + "]");
}
@Override
public void enterEveryRule(ParserRuleContext ctx) {
// System.out.println("Entering [" + ctx + "]");
}
@Override
public void exitEveryRule(ParserRuleContext ctx) {
// System.out.println("Exiting [" + ctx.getText() + "]");
}
}, postgreSQLParser.execute());
}
}
```
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