[
https://issues.apache.org/jira/browse/FLINK-8107?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16387448#comment-16387448
]
lincoln.lee commented on FLINK-8107:
------------------------------------
@Timo Walther
It seems not a bug here. The above case can successfully be validated after
minor modification:
{code:java}
val table = tEnv.sqlQuery("SELECT t.item FROM entity, UNNEST(entity.myarr) AS
t(item)"){code}
or
{code:java}
val table = tEnv.sqlQuery("SELECT t.item FROM UNNEST(select myarr from entity)
AS t(item)"){code}
UNNEST accepts a collection value expression which can be produced by an input
column reference or a subquery (or even a collection constructed by specific
elements).
The 'entity' in the query "SELECT t.item.* FROM product, UNNEST(entity.myarr)
AS t (item)" can not be recognized as a table.
> 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
> Affects Versions: 1.4.0
> Reporter: Timo Walther
> Priority: Major
>
> 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.
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
