Module targets 

Type selection and duplicate-column rules for whole and subscripted assignments.

Enums

AssignmentLevel

One level of an assignment target: a composite field, or the consecutive subscripts that transformAssignmentSubscripts applies together.

Functions

array_assignment_type

The array container produced by subscripting, before restoring a domain or legacy vector type.

assignment_levels

Group an assignment’s indirection into fields and subscript groups, in order.

assignment_value_type

Slices consume an array; any number of element subscripts consumes one scalar element.

field_assignment_types

The type each level of a field assignment applies to, followed by the type the assigned value must have, as transformAssignmentIndirection resolves them: a field names an attribute of a composite type or of a domain over one, and a subscript group selects an array element, or keeps the array for a slice.

has_field_step

Whether an assignment writes a composite field somewhere along its indirection.

validate_assignment_default

validate_assignment_result

Subscripting yields an ordinary array; the declared destination must accept that container.

validate_assignment_source

Type errors retain PostgreSQL’s separate primary message and rewrite hint.

validate_assignment_type

Whole-column writes may target an open schema. Partial writes require a declared container type before evaluating bounds or values.

validate_repeated_targets

Repeated partial targets compose, but a whole-column write cannot share its destination.