Function plpgsql_pre_column_ref

src/pl/plpgsql/src/pl_comp.c:1112–1121

* plpgsql_pre_column_ref parser callback before parsing a ColumnRef */

 * plpgsql_pre_column_ref		parser callback before parsing a ColumnRef
 */
static Node *
plpgsql_pre_column_ref(ParseState *pstate, ColumnRef *cref)
{
	PLpgSQL_expr *expr = (PLpgSQL_expr *) pstate->p_ref_hook_state;

	if (expr->func->resolve_option == PLPGSQL_RESOLVE_VARIABLE)
		return resolve_column_ref(pstate, expr, cref, false);
	else
		return NULL;
}

/*
 * plpgsql_post_column_ref		parser callback after parsing a ColumnRef