Jokser opened a new issue, #13208:
URL: https://github.com/apache/arrow/issues/13208
Hi everybody.
I develop gRPC services that operate with arrow types in order to perform
some DDL actions (e.g. create a table with columns that have arrow types).
In order to do it, I have to repeat arrow type enums and other things
related to arrow type configuration (scale, precision for decimal, time units
for timestamp/time types, dictionary encoding, etc.)
Example:
```
// 1-1 mapping to arrow::TimeUnit.
enum TimeUnit {
NONE = 0; // Used as indicator that unit is not set.
SECONDS = 1;
MILLISECONDS = 2;
MICROSECONDS = 3;
NANOSECONDS = 4;
}
enum ArrowType {
NA = 0; // Used as indicator that type is not set
BOOL = 1;
UINT8 = 2;
INT8 = 3;
UINT16 = 4;
INT16 = 5;
UINT32 = 6;
INT32 = 7;
UINT64 = 8;
INT64 = 9;
HALF_FLOAT = 10;
FLOAT = 11;
DOUBLE = 12;
STRING = 13;
BINARY = 14;
FIXED_SIZE_BINARY = 15;
DATE32 = 16;
DATE64 = 17;
TIMESTAMP = 18;
TIME32 = 19;
TIME64 = 20;
INTERVAL_MONTHS = 21;
INTERVAL_DAY_TIME = 22;
DECIMAL = 23;
DECIMAL256 = 24;
LIST = 25;
STRUCT = 26;
SPARSE_UNION = 27;
DENSE_UNION = 28;
DICTIONARY = 29;
MAP = 30;
EXTENSION = 31;
FIXED_SIZE_LIST = 32;
DURATION = 33;
LARGE_STRING = 34;
LARGE_BINARY = 35;
LARGE_LIST = 36;
INTERVAL_MONTH_DAY_NANO = 37;
}
/// And so on.
```
On the server-side, I do enum casts and manual arrow types constructions in
order to get complete arrow::Type for a configured column.
It would be much easier to have a ready protobuf specification for that
thing and a plugin that will generate protobuf classes with an implicit
conversion to arrow::Type.
WDYT about it?
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