SqlOperandMetadata only needs to be implemented by user-defined functions. (User-defined functions have fixed number of parameters, and the parameters have names; built-in functions may have a variable number of arguments, but they do not have names.)
So, maybe the cause is a function that isn’t sure whether it’s a UDF or a built-in. My money is on user error rather than Calcite bug. > On Jul 28, 2021, at 12:19 AM, Yanjing Wang <zhuangzixiao...@gmail.com> wrote: > > It may be a bug caused by CALCITE-4427 > <https://issues.apache.org/jira/browse/CALCITE-4427>, I > think lookupSubjectRoutines behavior is a bit strange. when found routines > are less than two, It returns directly whatever the routine SqlKind is. > otherwise filtered by SqlKind. This behavior may cause empty routine > results when all candidates are filtered out. @Julian, could you help the > exception to be fixed? > > wrstrs <wrs...@foxmail.com> 于2021年7月27日周二 下午3:33写道： > >> Hi, all >> >> how to solve this problem? >> >> >> >> >> my code: >> String sql = "select UNIX_TIMESTAMP(concat(substr('2021-07-27 >> 12:12:12',0,11),'09:00:00'))"; >> >> SqlOperatorTable opTab = >> >> SqlLibraryOperatorTableFactory.INSTANCE.getOperatorTable(EnumSet.of( >> SqlLibrary.HIVE, >> SqlLibrary.SPARK, SqlLibrary.BIG_QUERY, SqlLibrary.ORACLE, >> SqlLibrary.MYSQL, SqlLibrary.STANDARD)); >> SchemaPlus rootSchema = Frameworks.createRootSchema(true); >> >> FrameworkConfig frameworkConfig = Frameworks.newConfigBuilder() >> .defaultSchema(rootSchema) >> .operatorTable(opTab) >> .build(); >> >> Planner planner = Frameworks.getPlanner(frameworkConfig); >> SqlNode sqlNode = planner.parse(sql); >> SqlNode validateSqlNode = planner.validate(sqlNode); >> >> >> >> throw exception: >> >> Exception in thread "main" org.apache.calcite.tools.ValidationException: >> java.lang.ClassCastException: >> org.apache.calcite.sql.type.FamilyOperandTypeChecker cannot be cast to >> org.apache.calcite.sql.type.SqlOperandMetadata >> >> at >> org.apache.calcite.prepare.PlannerImpl.validate(PlannerImpl.java:228) >> >> Caused by: java.lang.ClassCastException: >> org.apache.calcite.sql.type.FamilyOperandTypeChecker cannot be cast to >> org.apache.calcite.sql.type.SqlOperandMetadata >> >> at >> org.apache.calcite.sql.validate.implicit.TypeCoercionImpl.userDefinedFunctionCoercion(TypeCoercionImpl.java:589) >> >> at >> org.apache.calcite.sql.SqlFunction.deriveType(SqlFunction.java:303) >> >> at >> org.apache.calcite.sql.SqlFunction.deriveType(SqlFunction.java:231)
