dialect/sql/schema: add option to control symbol hashing logic for schema dump (#4411)

dialect/sql/schema/atlas.go

@@ -38,6 +38,7 @@ type Atlas struct {
 	dropColumns     bool   // drop deleted columns
 	dropIndexes     bool   // drop deleted indexes
 	withForeignKeys bool   // with foreign keys
+	hashSymbols     bool   // whether to use a hash for too long symbols, only for StateReader
 	mode            Mode
 	hooks           []Hook              // hooks to apply before creation
 	diffHooks       []DiffHook          // diff hooks to run when diffing current and desired
@@ -528,6 +529,9 @@ func (a *Atlas) StateReader(tables ...*Table) migrate.StateReaderFunc {
 			}
 			a.sqlDialect = drv
 		}
+		if a.hashSymbols {
+			a.setupTables(tables)
+		}
 		return a.realm(tables)
 	}
 }