Module attributes 

The checks PostgreSQL makes of routine attributes, each at its own stage: compute_common_attribute for each clause in written order, the values compute_function_attributes and AlterFunction interpret, and the language, transforms, body and ROWS that CreateFunction examines.

Functions

check_attribute_clauses

Reject the first clause, in written order, that a procedure cannot have or that repeats an earlier clause, as compute_common_attribute and compute_function_attributes do.

reject_window_function

A window function, which PostgreSQL creates where every other check passes and which this engine cannot run.

validate_body_form

The body interpret_AS_clause accepts: exactly one of an AS body and a SQL-standard body, a SQL-standard body only for SQL, and one AS item for the languages here.

validate_cost

COST must be positive, which PostgreSQL checks of the value it stores in a float4.

validate_parallel

The PARALLEL value interpret_func_parallel accepts.

validate_routine_language

The language CreateFunction looks up: a routine without one reports no language specified, and only SQL and PL/pgSQL exist.

validate_rows

ROWS must be positive, which PostgreSQL checks of the value it stores in a float4.

validate_rows_applicability

ROWS is not applicable when function does not return a set.

validate_transforms

The transforms of TRANSFORM FOR TYPE, which CreateFunction looks up for the routine’s language after it checks LEAKPROOF: each type must exist, and the first reports that no transform exists for its element type, since no transform exists for any type.