[jira] [Created] (FLINK-8107) UNNEST causes cyclic type checking exception

[Shang Yuanchun (Jira)]

Timo Walther created FLINK-8107:
-----------------------------------

             Summary: UNNEST causes cyclic type checking exception
                 Key: FLINK-8107
                 URL: https://issues.apache.org/jira/browse/FLINK-8107
             Project: Flink
          Issue Type: Bug
          Components: Table API & SQL
            Reporter: Timo Walther


The following query causes an assertion error:

{code}
  def main(args: Array[String]): Unit = {
    val env = ExecutionEnvironment.getExecutionEnvironment
    val tEnv = TableEnvironment.getTableEnvironment(env)

    val input2 = env.fromElements(
      WC("hello", 1, Array(1, 2, 3)),
      WC("hello", 1, Array(1, 2, 3)),
      WC("ciao", 1, Array(1, 2, 3))
    )

    tEnv.registerDataSet("entity", input2)
    tEnv.registerDataSet("product", input2, 'product)

    val table = tEnv.sqlQuery("SELECT t.item.* FROM product, UNNEST(entity.myarr) AS t (item)")

    table.toDataSet[Row].print()
  }

  case class WC(word: String, frequency: Long, myarr: Array[Int])
{code}

It leads to:

{code}
Exception in thread "main" java.lang.AssertionError: Cycle detected during type-checking
        at org.apache.calcite.sql.validate.AbstractNamespace.validate(AbstractNamespace.java:93)
        at org.apache.calcite.sql.validate.SqlValidatorImpl.validateNamespace(SqlValidatorImpl.java:945)
        at org.apache.calcite.sql.validate.AbstractNamespace.getRowType(AbstractNamespace.java:115)
        at org.apache.calcite.sql.validate.AbstractNamespace.getRowTypeSansSystemColumns(AbstractNamespace.java:122)
        at org.apache.calcite.sql.validate.AliasNamespace.validateImpl(AliasNamespace.java:71)
        at org.apache.calcite.sql.validate.AbstractNamespace.validate(AbstractNamespace.java:84)
        at org.apache.calcite.sql.validate.SqlValidatorImpl.validateNamespace(SqlValidatorImpl.java:945)
        at org.apache.calcite.sql.validate.AbstractNamespace.getRowType(AbstractNamespace.java:115)
        at org.apache.calcite.sql.validate.AliasNamespace.getRowType(AliasNamespace.java:41)
        at org.apache.calcite.sql.validate.DelegatingScope.resolveInNamespace(DelegatingScope.java:101)
        at org.apache.calcite.sql.validate.ListScope.resolve(ListScope.java:191)
        at org.apache.calcite.sql.validate.ListScope.findQualifyingTableNames(ListScope.java:156)
        at org.apache.calcite.sql.validate.DelegatingScope.fullyQualify(DelegatingScope.java:326)
        at org.apache.calcite.sql.validate.SqlValidatorImpl.validateIdentifier(SqlValidatorImpl.java:2785)
        at org.apache.calcite.sql.SqlIdentifier.validateExpr(SqlIdentifier.java:324)
        at org.apache.calcite.sql.SqlOperator.validateCall(SqlOperator.java:407)
        at org.apache.calcite.sql.validate.SqlValidatorImpl.validateCall(SqlValidatorImpl.java:5084)
        at org.apache.calcite.sql.validate.UnnestNamespace.validateImpl(UnnestNamespace.java:52)
        at org.apache.calcite.sql.validate.AbstractNamespace.validate(AbstractNamespace.java:84)
        at org.apache.calcite.sql.validate.SqlValidatorImpl.validateNamespace(SqlValidatorImpl.java:945)
        at org.apache.calcite.sql.validate.SqlValidatorImpl.validateQuery(SqlValidatorImpl.java:926)
        at org.apache.calcite.sql.validate.SqlValidatorImpl.validateFrom(SqlValidatorImpl.java:2961)
        at org.apache.calcite.sql.validate.SqlValidatorImpl.validateFrom(SqlValidatorImpl.java:2946)
        at org.apache.calcite.sql.validate.SqlValidatorImpl.validateJoin(SqlValidatorImpl.java:2998)
        at org.apache.flink.table.calcite.FlinkCalciteSqlValidator.validateJoin(FlinkCalciteSqlValidator.scala:67)
        at org.apache.calcite.sql.validate.SqlValidatorImpl.validateFrom(SqlValidatorImpl.java:2955)
        at org.apache.calcite.sql.validate.SqlValidatorImpl.validateSelect(SqlValidatorImpl.java:3206)
        at org.apache.calcite.sql.validate.SelectNamespace.validateImpl(SelectNamespace.java:60)
        at org.apache.calcite.sql.validate.AbstractNamespace.validate(AbstractNamespace.java:84)
        at org.apache.calcite.sql.validate.SqlValidatorImpl.validateNamespace(SqlValidatorImpl.java:945)
        at org.apache.calcite.sql.validate.SqlValidatorImpl.validateQuery(SqlValidatorImpl.java:926)
        at org.apache.calcite.sql.SqlSelect.validate(SqlSelect.java:226)
        at org.apache.calcite.sql.validate.SqlValidatorImpl.validateScopedExpression(SqlValidatorImpl.java:901)
        at org.apache.calcite.sql.validate.SqlValidatorImpl.validate(SqlValidatorImpl.java:611)
        at org.apache.flink.table.calcite.FlinkPlannerImpl.validate(FlinkPlannerImpl.scala:89)
        at org.apache.flink.table.api.TableEnvironment.sqlQuery(TableEnvironment.scala:561)
        at org.apache.flink.table.examples.scala.WordCountSQL$.main(WordCountSQL.scala:57)
        at org.apache.flink.table.examples.scala.WordCountSQL.main(WordCountSQL.scala)
{code}

I think this is a Calcite bug but we have to check that first.



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