Values:
TYPE_UNSPECIFIED (0):
Illegal value
STRING (1):
64K, UTF8
INT64 (2):
64-bit signed
DOUBLE (3):
64-bit IEEE floating point
STRUCT (4):
Aggregate type
BYTES (5):
64K, Binary
BOOL (6):
2-valued
TIMESTAMP (7):
64-bit signed usec since UTC epoch
DATE (8):
Civil date - Year, Month, Day
TIME (9):
Civil time - Hour, Minute, Second,
Microseconds
DATETIME (10):
Combination of civil date and civil time
GEOGRAPHY (11):
Geography object
NUMERIC (12):
Numeric value
BIGNUMERIC (13):
BigNumeric value
INTERVAL (14):
Interval
JSON (15):
JSON, String
