refactor: reorder types

Author: steve-chavez

sql/pgrst_schema_cache.sql

@@ -4,6 +4,18 @@
 -- and pg doesn't allow it as a view column.
 create type ref_pair as (col text, ref text);
 
+-- type for the array of (column_name, view_columns[]), otherwise the creation of the function would fail same as above
+CREATE TYPE col_dep AS (
+  col          text,
+  view_columns text[]
+);
+
+CREATE TYPE key_dep_type AS enum(
+  'p',     -- pk dependency
+  'f_ref', -- fk dependency
+  'f'      -- fk reference dependency
+);
+
 create type relationship as (
   table_schema         text,
   table_name           text,
@@ -15,6 +27,34 @@ create type relationship as (
   is_one_to_one        bool
 );
 
+-- | A view foreign key or primary key dependency detected on its source table
+-- Each column of the key could be referenced multiple times in the view, e.g.
+--
+-- create view projects_view as
+-- select
+--   id as id_1,
+--   id as id_2,
+--   id as id_3,
+--   name
+-- from projects
+--
+-- In this case, the keyDepCols mapping maps projects.id to all three of the columns:
+--
+-- [('id', ['id_1', 'id_2', 'id_3'])]
+--
+-- Depending on key type, we can then choose how to handle this case. Primary keys
+-- can arbitrarily choose one of the columns, but for foreign keys we need to create
+-- relationships for each possible combinations.
+CREATE TYPE view_key_dependency AS (
+  table_schema        text,
+  table_name          text,
+  view_schema         text,
+  view_name           text,
+  constraint_name     text,
+  key_dep             key_dep_type,
+  column_dependencies col_dep[]
+);
+
 -- same query as PostgREST's allM2OandO2ORels
 create function all_m2o_and_o2o_rels ()
 returns setof relationship as $$
@@ -59,47 +99,6 @@ order by traint.conrelid, traint.conname;
 
 $$ language sql stable;
 
-
--- type for the array of (column_name, view_columns[]), otherwise the creation of the function would fail
-CREATE TYPE col_dep AS (
-  col          text,
-  view_columns text[]
-);
-
-CREATE TYPE key_dep_type AS enum(
-  'p',     -- pk dependency
-  'f_ref', -- fk dependency
-  'f'      -- fk reference dependency
-);
-
--- | A view foreign key or primary key dependency detected on its source table
--- Each column of the key could be referenced multiple times in the view, e.g.
---
--- create view projects_view as
--- select
---   id as id_1,
---   id as id_2,
---   id as id_3,
---   name
--- from projects
---
--- In this case, the keyDepCols mapping maps projects.id to all three of the columns:
---
--- [('id', ['id_1', 'id_2', 'id_3'])]
---
--- Depending on key type, we can then choose how to handle this case. Primary keys
--- can arbitrarily choose one of the columns, but for foreign keys we need to create
--- relationships for each possible combinations.
-CREATE TYPE view_key_dependency AS (
-  table_schema        text,
-  table_name          text,
-  view_schema         text,
-  view_name           text,
-  constraint_name     text,
-  key_dep             key_dep_type,
-  column_dependencies col_dep[]
-);
-
 -- Same query as PostgREST's allViewsKeyDependencies
 --  Returns all the views' primary keys and foreign keys dependencies
 -- query explanation at: