diff --git a/storage/innobase/data/data0type.cc b/storage/innobase/data/data0type.cc
index 0e07ca5182b..53d019a4664 100644
--- a/storage/innobase/data/data0type.cc
+++ b/storage/innobase/data/data0type.cc
@@ -79,67 +79,6 @@ dtype_get_at_most_n_mbchars(
 	return(data_len);
 }
 
-/*********************************************************************//**
-Checks if a data main type is a string type. Also a BLOB is considered a
-string type.
-@return TRUE if string type */
-ibool
-dtype_is_string_type(
-/*=================*/
-	ulint	mtype)	/*!< in: InnoDB main data type code: DATA_CHAR, ... */
-{
-	if (mtype <= DATA_BLOB
-	    || mtype == DATA_MYSQL
-	    || mtype == DATA_VARMYSQL) {
-
-		return(TRUE);
-	}
-
-	return(FALSE);
-}
-
-/*********************************************************************//**
-Checks if a type is a binary string type. Note that for tables created with
-< 4.0.14, we do not know if a DATA_BLOB column is a BLOB or a TEXT column. For
-those DATA_BLOB columns this function currently returns FALSE.
-@return TRUE if binary string type */
-ibool
-dtype_is_binary_string_type(
-/*========================*/
-	ulint	mtype,	/*!< in: main data type */
-	ulint	prtype)	/*!< in: precise type */
-{
-	if ((mtype == DATA_FIXBINARY)
-	    || (mtype == DATA_BINARY)
-	    || (mtype == DATA_BLOB && (prtype & DATA_BINARY_TYPE))) {
-
-		return(TRUE);
-	}
-
-	return(FALSE);
-}
-
-/*********************************************************************//**
-Checks if a type is a non-binary string type. That is, dtype_is_string_type is
-TRUE and dtype_is_binary_string_type is FALSE. Note that for tables created
-with < 4.0.14, we do not know if a DATA_BLOB column is a BLOB or a TEXT column.
-For those DATA_BLOB columns this function currently returns TRUE.
-@return TRUE if non-binary string type */
-ibool
-dtype_is_non_binary_string_type(
-/*============================*/
-	ulint	mtype,	/*!< in: main data type */
-	ulint	prtype)	/*!< in: precise type */
-{
-	if (dtype_is_string_type(mtype) == TRUE
-	    && dtype_is_binary_string_type(mtype, prtype) == FALSE) {
-
-		return(TRUE);
-	}
-
-	return(FALSE);
-}
-
 /*********************************************************************//**
 Validates a data type structure.
 @return TRUE if ok */
diff --git a/storage/innobase/handler/handler0alter.cc b/storage/innobase/handler/handler0alter.cc
index 23d2e310b21..65c105928e3 100644
--- a/storage/innobase/handler/handler0alter.cc
+++ b/storage/innobase/handler/handler0alter.cc
@@ -9034,9 +9034,7 @@ innobase_rename_or_enlarge_column_try(
 	const Create_field&	cf,
 	bool			is_v)
 {
-#ifdef UNIV_DEBUG
 	dict_col_t*	col;
-#endif /* UNIV_DEBUG */
 	dict_v_col_t*	v_col;
 
 	DBUG_ENTER("innobase_rename_or_enlarge_column_try");
@@ -9049,13 +9047,9 @@ innobase_rename_or_enlarge_column_try(
 	if (is_v) {
 		v_col = dict_table_get_nth_v_col(user_table, pos);
 		pos = dict_create_v_col_pos(v_col->v_pos, v_col->m_col.ind);
-#ifdef UNIV_DEBUG
 		col = &v_col->m_col;
-#endif /* UNIV_DEBUG */
 	} else {
-#ifdef UNIV_DEBUG
 		col = dict_table_get_nth_col(user_table, pos);
-#endif /* UNIV_DEBUG */
 	}
 
 	ulint prtype, mtype, len;
diff --git a/storage/innobase/include/data0type.h b/storage/innobase/include/data0type.h
index 3b3ac9d1885..aa63be9b8a1 100644
--- a/storage/innobase/include/data0type.h
+++ b/storage/innobase/include/data0type.h
@@ -1,7 +1,7 @@
 /*****************************************************************************
 
 Copyright (c) 1996, 2016, Oracle and/or its affiliates. All Rights Reserved.
-Copyright (c) 2017, 2018, MariaDB Corporation.
+Copyright (c) 2017, 2019, MariaDB Corporation.
 
 This program is free software; you can redistribute it and/or modify it under
 the terms of the GNU General Public License as published by the Free Software
@@ -262,35 +262,31 @@ dtype_get_at_most_n_mbchars(
 	ulint		data_len,	/*!< in: length of str (in bytes) */
 	const char*	str);		/*!< in: the string whose prefix
 					length is being determined */
-/*********************************************************************//**
-Checks if a data main type is a string type. Also a BLOB is considered a
-string type.
-@return TRUE if string type */
-ibool
-dtype_is_string_type(
-/*=================*/
-	ulint	mtype);	/*!< in: InnoDB main data type code: DATA_CHAR, ... */
-/*********************************************************************//**
-Checks if a type is a binary string type. Note that for tables created with
-< 4.0.14, we do not know if a DATA_BLOB column is a BLOB or a TEXT column. For
-those DATA_BLOB columns this function currently returns FALSE.
-@return TRUE if binary string type */
-ibool
-dtype_is_binary_string_type(
-/*========================*/
-	ulint	mtype,	/*!< in: main data type */
-	ulint	prtype);/*!< in: precise type */
-/*********************************************************************//**
-Checks if a type is a non-binary string type. That is, dtype_is_string_type is
-TRUE and dtype_is_binary_string_type is FALSE. Note that for tables created
-with < 4.0.14, we do not know if a DATA_BLOB column is a BLOB or a TEXT column.
-For those DATA_BLOB columns this function currently returns TRUE.
-@return TRUE if non-binary string type */
-ibool
-dtype_is_non_binary_string_type(
-/*============================*/
-	ulint	mtype,	/*!< in: main data type */
-	ulint	prtype);/*!< in: precise type */
+/** @return whether main type is a string type */
+inline bool dtype_is_string_type(ulint mtype)
+{
+	return mtype <= DATA_BLOB
+		|| mtype == DATA_MYSQL || mtype == DATA_VARMYSQL;
+}
+
+/** @return whether a type is a binary string type */
+inline bool dtype_is_binary_string_type(ulint mtype, ulint prtype)
+{
+	/* Note that for tables created before MySQL 4.0.14,
+	we do not know if a DATA_BLOB column is a BLOB or a TEXT column.
+	For those DATA_BLOB columns we return false. */
+
+	return mtype == DATA_FIXBINARY || mtype == DATA_BINARY
+		|| (mtype == DATA_BLOB && (prtype & DATA_BINARY_TYPE));
+}
+
+/** @return whether a type is a non-binary string type */
+inline bool dtype_is_non_binary_string_type(ulint mtype, ulint prtype)
+{
+	return dtype_is_string_type(mtype)
+		&& !dtype_is_binary_string_type(mtype, prtype);
+}
+
 /*********************************************************************//**
 Sets a data type structure. */
 UNIV_INLINE