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[jira] [Created] (CALCITE-2431) AssertionError: SqlUtil.getAncestry when providing completion hints for sub-schema


Vladimir Sitnikov created CALCITE-2431:
------------------------------------------

             Summary: AssertionError: SqlUtil.getAncestry when providing completion hints for sub-schema
                 Key: CALCITE-2431
                 URL: https://issues.apache.org/jira/browse/CALCITE-2431
             Project: Calcite
          Issue Type: Bug
          Components: core
    Affects Versions: 1.17.0
            Reporter: Vladimir Sitnikov
            Assignee: Julian Hyde


Test case (JdbcTest):
{code:java}  @Test public void testSqlAdvisorSubSchema()
      throws SQLException, ClassNotFoundException {
    adviseSql("select * from \"hr\".^.test_test_test",
        CalciteAssert.checkResultUnordered(
            "id=; names=null; type=MATCH",
            "id=hr.dependents; names=[hr, dependents]; type=TABLE",
            "id=hr.depts; names=[hr, depts]; type=TABLE",
            "id=hr.emps; names=[hr, emps]; type=TABLE",
            "id=hr.locations; names=[hr, locations]; type=TABLE",
            "id=hr; names=[hr]; type=SCHEMA"));
  }{code}

Relevant code (SqlUtil.getAncestry):
{code:java}  public static ImmutableList<SqlNode> getAncestry(SqlNode root,
      Predicate<SqlNode> predicate, Predicate<SqlNode> postPredicate) {
    try {
      new Genealogist(predicate, postPredicate).visitChild(root);
      throw new AssertionError("not found: " + predicate + " in " + root);
{code} 

Relevant code from {{SqlAdvisor.isSelectListItem}}: 
{code:java}
  private static boolean isSelectListItem(SqlNode root,
      final SqlParserPos pos) {
    List<SqlNode> nodes = SqlUtil.getAncestry(root,
        input -> input instanceof SqlIdentifier
            && Util.last(((SqlIdentifier) input).names)
                .equals(UPPER_HINT_TOKEN),
        input -> Objects.requireNonNull(input).getParserPosition()
            .startsAt(pos));
    assert nodes.get(0) == root;
    nodes = Lists.reverse(nodes);
    return nodes.size() > 2
        && nodes.get(2) instanceof SqlSelect
        && nodes.get(1) == ((SqlSelect) nodes.get(2)).getSelectList();
  }
{code}

It looks like {{Util.last(((SqlIdentifier) input).names).equals(UPPER_HINT_TOKEN)}} should be replaced with {{(SqlIdentifier) input).names.contains(UPPER_HINT_TOKEN)}}.

Note: the code is advisor-specific, so the replacement should be safe

Original exception:
{noformat}java.lang.AssertionError: not found: org.apache.calcite.sql.advise.SqlAdvisor$$Lambda$197/402207819@1b70203f in SELECT *
FROM `hr`.`_SUGGEST_`.`TEST_TEST_TEST`

	at org.apache.calcite.sql.SqlUtil.getAncestry(SqlUtil.java:872)
	at org.apache.calcite.sql.advise.SqlAdvisor.isSelectListItem(SqlAdvisor.java:242)
	at org.apache.calcite.sql.advise.SqlAdvisor.getCompletionHints(SqlAdvisor.java:220)
	at org.apache.calcite.sql.advise.SqlAdvisor.getCompletionHints0(SqlAdvisor.java:182)
	at org.apache.calcite.sql.advise.SqlAdvisor.getCompletionHints(SqlAdvisor.java:142)
	at org.apache.calcite.sql.advise.SqlAdvisorGetHintsFunction.getCompletionHints(SqlAdvisorGetHintsFunction.java:105)
	at Baz.bind(Unknown Source)
	at org.apache.calcite.jdbc.CalcitePrepare$CalciteSignature.enumerable(CalcitePrepare.java:356)
	at org.apache.calcite.jdbc.CalciteConnectionImpl.enumerable(CalciteConnectionImpl.java:309)
	at org.apache.calcite.jdbc.CalciteMetaImpl._createIterable(CalciteMetaImpl.java:506)
	at org.apache.calcite.jdbc.CalciteMetaImpl.createIterable(CalciteMetaImpl.java:497)
	at org.apache.calcite.avatica.AvaticaResultSet.execute(AvaticaResultSet.java:182)
	at org.apache.calcite.jdbc.CalciteResultSet.execute(CalciteResultSet.java:64)
	at org.apache.calcite.jdbc.CalciteResultSet.execute(CalciteResultSet.java:43)
	at org.apache.calcite.avatica.AvaticaConnection.executeQueryInternal(AvaticaConnection.java:573)
	at org.apache.calcite.avatica.AvaticaPreparedStatement.executeQuery(AvaticaPreparedStatement.java:137)
	at org.apache.calcite.test.JdbcTest.adviseSql(JdbcTest.java:441)
	at org.apache.calcite.test.JdbcTest.testSqlAdvisorSubSchema(JdbcTest.java:374){noformat}



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