Load column check expressions

CHANGELOG.md

@@ -58,6 +58,7 @@
 - Bug #456: Fix typecasting bit columns' values with big size (@Tigrov)
 - Chg #460: Throw exception on "unsigned" column usage (@vjik)
 - New #307: Add range and multirange columns support (@vjik, @Gerych1984)
+- Enh #464: Load column's check expressions for table schema (@Tigrov)
 
 ## 1.3.0 March 21, 2024
 

src/Schema.php

@@ -33,6 +33,7 @@
  * Implements the PostgreSQL Server specific schema, supporting PostgreSQL Server version 9.6 and above.
  *
  * @psalm-type ColumnArray = array{
+ *   check: string|null,
  *   column_name: string,
  *   data_type: string,
  *   type_type: string|null,
@@ -311,6 +312,7 @@ protected function findColumns(TableSchemaInterface $table): bool
                 a.atttypmod
             ) AS scale,
             ct.contype,
+            pg_get_constraintdef(chk.oid) AS "check",
             COALESCE(NULLIF(a.attndims, 0), NULLIF(t.typndims, 0), (t.typcategory='A')::int) AS dimension,
             co.collname AS collation,
             nco.nspname AS collation_schema
@@ -333,6 +335,15 @@ protected function findColumns(TableSchemaInterface $table): bool
                         || ct.conrelid || ' :resorigcol (?:'
                         || replace(substr(ct.conkey::text, 2, length(ct.conkey::text) - 2), ',', '|') || ') .*')
                 )
+            LEFT JOIN pg_constraint chk ON (chk.contype = 'c' AND cardinality(chk.conkey) = 1)
+                AND (
+                    chk.conrelid = c.oid AND a.attnum = ANY (chk.conkey)
+                    OR rw.ev_action IS NOT NULL AND chk.conrelid != 0
+                    AND strpos(rw.ev_action, ':resorigtbl ' || chk.conrelid || ' ') > 0
+                    AND rw.ev_action ~ ('.* :resno ' || a.attnum || ' :resname \S+ :ressortgroupref \d+ :resorigtbl '
+                        || chk.conrelid || ' :resorigcol (?:'
+                        || replace(substr(chk.conkey::text, 2, length(chk.conkey::text) - 2), ',', '|') || ') .*')
+                )
             LEFT JOIN (pg_collation co JOIN pg_namespace nco ON co.collnamespace = nco.oid)
                 ON a.attcollation = co.oid AND (nco.nspname != 'pg_catalog' OR co.collname != 'default')
         WHERE
@@ -510,6 +521,7 @@ private function loadColumn(array $info): ColumnInterface
 
         $columnInfo = [
             'autoIncrement' => (bool) $info['is_autoinc'],
+            'check' => !empty($info['check']) ? substr($info['check'], 8, -2) : null,
             'collation' => $collation,
             'comment' => $info['column_comment'],
             'dbType' => $dbType,

tests/Provider/SchemaProvider.php

@@ -252,6 +252,7 @@ public static function columns(): array
                         scale: 0,
                     ),
                     'C_check' => new StringColumn(
+                        check: '("C_check")::text <> \'\'::text',
                         dbType: 'varchar',
                         size: 255,
                     ),