END;
$$ LANGUAGE PLPGSQL STRICT VOLATILE;
+-- creates other child table so you can have more than one child table in a schema from a base table
+CREATE OR REPLACE FUNCTION build_variant_staging_table(text, text, text)
+ RETURNS void
+ LANGUAGE plpgsql
+ STRICT
+AS $function$
+ DECLARE
+ migration_schema ALIAS FOR $1;
+ production_table ALIAS FOR $2;
+ base_staging_table ALIAS FOR $3;
+ columns RECORD;
+ BEGIN
+ --RAISE INFO 'In migration_tools.build_specific_base_staging_table(%,%) -> %', migration_schema, production_table, base_staging_table;
+ PERFORM migration_tools.exec( $1, 'CREATE TABLE ' || migration_schema || '.' || base_staging_table || ' ( LIKE ' || production_table || ' INCLUDING DEFAULTS EXCLUDING CONSTRAINTS );' );
+ PERFORM migration_tools.exec( $1, '
+ INSERT INTO ' || migration_schema || '.fields_requiring_mapping
+ SELECT table_schema, table_name, column_name, data_type
+ FROM information_schema.columns
+ WHERE table_schema = ''' || migration_schema || ''' AND table_name = ''' || base_staging_table || ''' AND is_nullable = ''NO'' AND column_default IS NULL;
+ ' );
+ FOR columns IN
+ SELECT table_schema, table_name, column_name, data_type
+ FROM information_schema.columns
+ WHERE table_schema = migration_schema AND table_name = base_staging_table AND is_nullable = 'NO' AND column_default IS NULL
+ LOOP
+ PERFORM migration_tools.exec( $1, 'ALTER TABLE ' || columns.table_schema || '.' || columns.table_name || ' ALTER COLUMN ' || columns.column_name || ' DROP NOT NULL;' );
+ END LOOP;
+ END;
+$function$
+
CREATE OR REPLACE FUNCTION migration_tools.create_linked_legacy_table_from (TEXT,TEXT,TEXT) RETURNS VOID AS $$
DECLARE
migration_schema ALIAS FOR $1;