Module datafusion_substrait::variation_const

Type variation constants

To add support for types not in the core specification, we make use of the simple extensions of substrait type. This module contains the constants used to identify the type variation.

The rules of type variations here are:

• Default type reference is 0. It is used when the actual type is the same with the original type.
• Extended variant type references start from 1, and ususlly increase by 1.

TODO: Definitions here are not the final form. All the non-system-preferred variations will be defined using simple extensions as per the spec of type_variations https://github.com/apache/datafusion/issues/11545

Constants

• DATE_32_TYPE_VARIATION_REF
• DATE_64_TYPE_VARIATION_REF
• DECIMAL_128_TYPE_VARIATION_REF
• DECIMAL_256_TYPE_VARIATION_REF
• DEFAULT_CONTAINER_TYPE_VARIATION_REF
• DEFAULT_TYPE_VARIATION_REF
  The “system-preferred” variation (i.e., no variation).
• INTERVAL_DAY_TIME_TYPE_REFDeprecated
  For DataType::Interval with IntervalUnit::DayTime.
• INTERVAL_MONTH_DAY_NANO_TYPE_NAME
  For DataType::Interval with IntervalUnit::MonthDayNano.
• INTERVAL_MONTH_DAY_NANO_TYPE_REFDeprecated
  For DataType::Interval with IntervalUnit::MonthDayNano.
• INTERVAL_YEAR_MONTH_TYPE_REFDeprecated
  For DataType::Interval with IntervalUnit::YearMonth.
• LARGE_CONTAINER_TYPE_VARIATION_REF
• TIMESTAMP_MICRO_TYPE_VARIATION_REF
• TIMESTAMP_MILLI_TYPE_VARIATION_REF
• TIMESTAMP_NANO_TYPE_VARIATION_REF
• TIMESTAMP_SECOND_TYPE_VARIATION_REF
• UNSIGNED_INTEGER_TYPE_VARIATION_REF