added plugins

plugins/dbgate-plugin-postgres/src/backend/sql/columns.js

@@ -0,0 +1,19 @@
+module.exports = `
+select 
+	table_schema as "schemaName", 
+	table_name as "pureName", 
+	column_name as "columnName",
+	is_nullable as "isNullable",
+	data_type as "dataType",
+	character_maximum_length as "charMaxLength",
+	numeric_precision as "numericPrecision",
+	numeric_scale as "numericScale",
+	column_default as "defaultValue"
+from information_schema.columns
+where 
+		table_schema <> 'information_schema' 
+		and table_schema <> 'pg_catalog' 
+		and table_schema !~ '^pg_toast' 
+		and 'tables:' || table_schema || '.' || table_name =OBJECT_ID_CONDITION
+order by ordinal_position
+`;