Type information for fields in schemas and partition schemas.
Values:
TYPE_UNSPECIFIED (0):
SchemaType unspecified.
BOOLEAN (1):
Boolean field.
BYTE (2):
Single byte numeric field.
INT16 (3):
16-bit numeric field.
INT32 (4):
32-bit numeric field.
INT64 (5):
64-bit numeric field.
FLOAT (6):
Floating point numeric field.
DOUBLE (7):
Double precision numeric field.
DECIMAL (8):
Real value numeric field.
STRING (9):
Sequence of characters field.
BINARY (10):
Sequence of bytes field.
TIMESTAMP (11):
Date and time field.
DATE (12):
Date field.
TIME (13):
Time field.
RECORD (14):
Structured field. Nested fields that define
the structure of the map. If all nested fields
are nullable, this field represents a union.
NULL (100):
Null field that does not have values.
