walterddr opened a new issue, #8605:
URL: https://github.com/apache/pinot/issues/8605
Background
===
Currently Pinot already implements some of the type hoisting - for example:
* the datatable builder automatically converts int/float/long/double numeric
type content to the corresponding data schema required data type.
However sometime this doesn't work quite well. for example
* sum(long, long) will result in double
Propose
===
- Create a type inference system to automatically hoist types to when
searching for a matching `@ScalarFunction`. for example `sum(int, long)` should
match `sum(long, long)` with an implicit type cast from `int` to `long` for the
first argument.
- implementing a type casting scheme using a bitmap approach:
- for example using numeric values, `double, float, long, int, short,
byte` corresponding to a single bit in a byte value (`1<<6` ~ `1<<0`) and make
all function arguments to mask into the byte and uses the highest non-zero bit
corresponding type as the numeric type to cast to.
- for other type we can have different rules to match types
- implicit type cast methods can also be unified and reused in other part of
the query logic and ingestion.
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