PG_CAST

PG_CAST records the conversion relationship between data types.

Table 1 PG_CAST columns

Name

Type

Description

oid

oid

Row identifier (hidden attribute, which must be specified)

castsource

oid

OID of the source data type

casttarget

oid

OID of the target data type

castfunc

oid

OID of the conversion function (0 if no conversion function is required)

castcontext

"char"

Conversion mode between the source and target data types.
  • e: Only explicit conversion can be performed (using the CAST or :: syntax).
  • i: Only implicit conversion can be performed.
  • a: Both explicit and implicit conversion can be performed between data types.

castmethod

"char"

Conversion method.
  • f: Conversion is performed using the specified function in the castfunc column.
  • 'b': Binary forcible conversion rather than the specified function in the castfunc column is performed between data types.
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