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https://issues.apache.org/jira/browse/CALCITE-5948?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17786582#comment-17786582
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Ran Tao commented on CALCITE-5948:
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[~swtalbot] hi, thanks for your feedback.
I want to know what your scenario is. As the array function is defined, it
should be a same type. Calcite ensures this by extracting the
biggest/leastRestrictive type of the element on the type side. But the final
array list is a heterogeneous list if no explicit conversion is performed.
> Use explicit casting if element type in ARRAY/MAP does not equal derived
> component type
> ---------------------------------------------------------------------------------------
>
> Key: CALCITE-5948
> URL: https://issues.apache.org/jira/browse/CALCITE-5948
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.35.0
> Reporter: Ran Tao
> Assignee: Ran Tao
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.36.0
>
>
> First, we need to reach a consensus to allow types of the same family to
> coexist in multiset such as array and map.
> It means the form like `{*}array(1, cast(2 as tinyint)){*}` is correct(the
> LeastRestrictiveType is Integer). However, this function validate success in
> calcite but it failed in runtime, exception stack is:
> {code:java}
> java.lang.ClassCastException: class java.lang.Byte cannot be cast to class
> java.lang.Integer
> at
> org.apache.calcite.avatica.util.AbstractCursor$IntAccessor.getInt(AbstractCursor.java:522)
> at
> org.apache.calcite.avatica.util.AbstractCursor$ArrayAccessor.convertValue(AbstractCursor.java:1396)
> at
> org.apache.calcite.avatica.util.AbstractCursor$ArrayAccessor.getObject(AbstractCursor.java:1377)
> at
> org.apache.calcite.avatica.util.AbstractCursor$ArrayAccessor.getArray(AbstractCursor.java:1432)
> at
> org.apache.calcite.avatica.util.AbstractCursor$ArrayAccessor.getString(AbstractCursor.java:1444)
> at
> org.apache.calcite.avatica.AvaticaResultSet.getString(AvaticaResultSet.java:241)
> at org.apache.calcite.util.JdbcTypeImpl$10.get(JdbcTypeImpl.java:112)
> at org.apache.calcite.util.JdbcTypeImpl$10.get(JdbcTypeImpl.java:109)
> at
> org.apache.calcite.sql.test.ResultCheckers.compareResultSetWithMatcher(ResultCheckers.java:248)
> at
> org.apache.calcite.sql.test.ResultCheckers$MatcherResultChecker.checkResult(ResultCheckers
> {code}
>
> And `{*}map[1, 1, 2, cast(1 as tinyint)]{*}` is correct but calcite throw
> exception:
> {code:java}
> java.lang.AssertionError: Expected query to throw exception, but it did not;
> query [values (map[1, 1, 2, cast(1 as tinyint)])]; expected [Parameters must
> be of the same type]
> at org.apache.calcite.sql.test.SqlTests.checkEx(SqlTests.java:240)
> at
> org.apache.calcite.sql.test.AbstractSqlTester.assertExceptionIsThrown(AbstractSqlTester.java:111)
> at
> org.apache.calcite.test.SqlOperatorFixtureImpl.checkQueryFails(SqlOperatorFixtureImpl.java:174)
> {code}
>
> std ArrayConstructor.
> {code:java}
> public class SqlArrayValueConstructor extends SqlMultisetValueConstructor {
> public SqlArrayValueConstructor() {
> super("ARRAY", SqlKind.ARRAY_VALUE_CONSTRUCTOR);
> }
> @Override public RelDataType inferReturnType(SqlOperatorBinding opBinding) {
> RelDataType type =
> getComponentType(
> opBinding.getTypeFactory(),
> opBinding.collectOperandTypes());
> --> we need explicit cast here
> requireNonNull(type, "inferred array element type");
> return SqlTypeUtil.createArrayType(
> opBinding.getTypeFactory(), type, false);
> }
> } {code}
> std map constructor:
> {code:java}
> public class SqlMapValueConstructor extends SqlMultisetValueConstructor {
> public SqlMapValueConstructor() {
> super("MAP", SqlKind.MAP_VALUE_CONSTRUCTOR);
> }
> @Override public RelDataType inferReturnType(SqlOperatorBinding opBinding) {
> Pair<@Nullable RelDataType, @Nullable RelDataType> type =
> getComponentTypes(
> opBinding.getTypeFactory(), opBinding.collectOperandTypes());
> --> we need explicit cast here
> return SqlTypeUtil.createMapType(
> opBinding.getTypeFactory(),
> requireNonNull(type.left, "inferred key type"),
> requireNonNull(type.right, "inferred value type"),
> false);
> }
> }{code}
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