yaooqinn opened a new pull request, #45925:
URL: https://github.com/apache/spark/pull/45925
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### What changes were proposed in this pull request?
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In this PR, I proposed to add support for reading well-defined ANSI interval
types from Oracle databases.
- NTERVAL YEAR [(year_precision)] TO MONTH
- Stores a period of time in years and months, where year_precision is the
number of digits in the YEAR datetime field. Accepted values are 0 to 9. The
default is 2. The size is fixed at 5 bytes.
- INTERVAL DAY [(day_precision)] TO SECOND [(fractional_seconds_precision)]
- Stores a period of time in days, hours, minutes, and seconds, where
- day_precision is the maximum number of digits in the DAY datetime
field. Accepted values are 0 to 9. The default is 2.
- fractional_seconds_precision is the number of digits in the fractional
part of the SECOND field. Accepted values are 0 to 9. The default is 6. The
size is fixed at 11 bytes.
Both of them are mapped to the defaults of AnsiIntervalTypes.
We also add two developer APIs that convert interval strings to underlying
representations of YearMonthIntervalType and DaytimeIntervalType. The default
implementations assume that the inputs are compatible with the ANSI style,
incompatible values will fail to be parsed. However, it shall fail much earlier
at the data type mapping step because of undefined mapping rules
### Why are the changes needed?
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Improve the Oracle accessibility, as tt's safe to read Oracle external
intervals
### Does this PR introduce _any_ user-facing change?
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Yes, reading Oracle intervals are available now
### How was this patch tested?
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-->new tests
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