walterddr commented on code in PR #10814:
URL: https://github.com/apache/pinot/pull/10814#discussion_r1224914165
##########
pinot-query-planner/src/main/java/org/apache/pinot/query/type/TypeSystem.java:
##########
@@ -70,4 +70,16 @@ public RelDataType deriveAvgAggType(RelDataTypeFactory
typeFactory,
}
}
}
+
+ // overriding the function for handling comparison between different data
types.
+ // based on the precision value calcite adds the CAST function to make
operands of same type for comparison.
+ @Override public int getDefaultPrecision(SqlTypeName typeName) {
+ switch (typeName) {
+ case DOUBLE:
+ return 16;
+ default:
+ // Following BasicSqlType precision as the default
+ return super.getDefaultPrecision(typeName);
+ }
Review Comment:
`SqlTypeFactoryImpl` uses `RelDataTypeSystemImpl` to compute the
scale/precision, which behaves the same as JavaTypeFactoryImpl.
```
...
case REAL:
return 7;
case FLOAT:
case DOUBLE:
return 15;
```
what we should really do here is to change `TypeFactory` to :
```
case FLOAT:
return fieldSpec.isSingleValueField() ?
createSqlType(SqlTypeName.REAL) // instead of FLOAT
: createArrayType(createSqlType(SqlTypeName.REAL), -1);
```
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