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PG_CAST

PG_CAST stores conversion relationships between data types.

Table 1 PG_CAST columns

Name

Type

Description

castsource

oid

OID of the source data type

casttarget

oid

OID of the target data type

castfunc

oid

OID of the conversion function If the value is 0, no conversion function is required.

castcontext

"char"

Conversion mode between the source and target data types

  • 'e': indicates that only explicit conversion can be performed (using the CAST or :: syntax).
  • 'i': indicates that only implicit conversion can be performed.
  • 'a': indicates that both explicit and implicit conversion can be performed between data types.

castmethod

"char"

Conversion method

  • 'f': indicates that conversion is performed using the specified function in the castfunc column.
  • 'b': indicates that binary forcible conversion rather than the specified function in the castfunc column is performed between data types.