[jira] [Created] (CALCITE-4407) Support unparse special syntax when operator is DELETA

[xzh_dz (Jira)]

xzh_dz created CALCITE-4407:
-------------------------------

             Summary: Support unparse special syntax when operator is DELETA
                 Key: CALCITE-4407
                 URL: https://issues.apache.org/jira/browse/CALCITE-4407
             Project: Calcite
          Issue Type: Wish
            Reporter: xzh_dz
         Attachments: image-2020-11-18-16-12-18-340.png

This exception can be reproduced as below:
SqlParserTest:
{code:java}
// code placeholder
@Test void testSqlDeleteSqlBasicCallToString() throws Exception {
  final String sql0 = "delete from emps";
  final SqlNode sqlNode0 = getSqlParser(sql0).parseStmt();
  final SqlNode sqlNodeVisited0 = sqlNode0.accept(new SqlShuttle() {
    @Override public SqlNode visit(SqlIdentifier identifier) {
      return new SqlIdentifier(identifier.names,
          identifier.getParserPosition());
    }
  });
  System.out.println(sqlNodeVisited0.toString());
}{code}
Exception:
{code:java}
// code placeholder
java.lang.UnsupportedOperationException: class 
org.apache.calcite.sql.SqlSyntax$7: 
SPECIALjava.lang.UnsupportedOperationException: class 
org.apache.calcite.sql.SqlSyntax$7: SPECIAL
 at org.apache.calcite.util.Util.needToImplement(Util.java:1080) at 
org.apache.calcite.sql.SqlSyntax$7.unparse(SqlSyntax.java:128) at 
org.apache.calcite.sql.SqlOperator.unparse(SqlOperator.java:377) at 
org.apache.calcite.sql.SqlDialect.unparseCall(SqlDialect.java:453) at 
org.apache.calcite.sql.SqlCall.unparse(SqlCall.java:103) at 
org.apache.calcite.sql.SqlNode.toSqlString(SqlNode.java:155)
{code}



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