Package org.apache.druid.sql.calcite.expression.builtin

Class NestedDataOperatorConversions.DruidJsonValueConvertletFactory

java.lang.Object
org.apache.druid.sql.calcite.expression.builtin.NestedDataOperatorConversions.DruidJsonValueConvertletFactory
All Implemented Interfaces:
DruidConvertletFactory
Enclosing class:
NestedDataOperatorConversions
public static class NestedDataOperatorConversions.DruidJsonValueConvertletFactory extends Object implements DruidConvertletFactory
The StandardConvertletTable converts json_value(.. RETURNING type) into cast(json_value_any(..), type). This is not that useful for us, so we have our own convertlet, to translate into specialized operators such as NestedDataOperatorConversions.JsonValueBigintOperatorConversion, NestedDataOperatorConversions.JsonValueDoubleOperatorConversion, or NestedDataOperatorConversions.JsonValueVarcharOperatorConversion, before falling back to NestedDataOperatorConversions.JsonValueAnyOperatorConversion. This convertlet still always wraps the function in a SqlStdOperatorTable.CAST, to smooth out type mismatches, such as VARCHAR(2000) vs VARCHAR or whatever else various type checkers like to complain about not exactly matching.