diff --git a/mysql-test/innodb-zip.result b/mysql-test/innodb-zip.result
index 634f77ddfec..22621eb9383 100644
--- a/mysql-test/innodb-zip.result
+++ b/mysql-test/innodb-zip.result
@@ -131,6 +131,24 @@ INSERT INTO t1 VALUES(
 'FOXajs|.7@IR[dmv(2<FPZdnx+5?IS]gq{.8BLV`jt~1;EOYcmw*4>HR\fpz-7AKU_is}0:DNXblv)3=GQ[eoy,6@JT^hr|/9CMWaku(3>IT_ju)4?JU`kv*5@KValw+6ALWbmx,7BMXcny-8CNYdoz.9DOZep{/:EP[fq|0;FQ\gr}1<GR]hs~2=HS^it(4@LXdp|1=IUamy.:FR^jv+7CO[gs(4@LXdp|1=IUamy.:FR^jv+7CO[gs(4@LXdp|1=IUamy.:FR^jv+7CO[gs(5BO\iv,9FS`mz0=JWdq~4AN[hu+8ER_ly/<IVcp}3@MZgt*7DQ^kx.;HUbo|2?LYfs)6CP]jw-:GTan{1>KXer(6DR`n|3AO]ky0>LZhv-;IWes*8FTbp~5CQ_m{2@N\jx/=KYgu,:HVdr)7ESao}4BP^lz1?M[iw.<JXft+9GUcq(7FUds+:IXgv.=L[jy1@O^m|4CRap(7FUds+:IXgv.=L[jy1@O^m|4CRap(7FUds+:IXgv.=L[jy1@O^m|4CRap(8HXhx1AQaq*:JZjz3CScs,<L\l|5EUeu.>N^n~7GWgw0@P`p)9IYiy2BRbr+;K[k{4DTdt-=M]m}6FVfv/?O_o(9J[l}7HYj{5FWhy3DUfw1BSdu/@Qbs->O`q+<M^o):K\m~8IZk|6GXiz4EVgx2CTev0ARct.?Par,=N_p*;L]n(:L^p+=Oas.@Rdv1CUgy4FXj|7I[m(:L^p+=Oas.@Rdv1CUgy4FXj|7');
 ERROR 42000: Row size too large. The maximum row size for the used table type, not counting BLOBs, is 8126. You have to change some columns to TEXT or BLOBs
 drop table t1;
+create table t1( c1 int not null, c2 blob, c3 blob, c4 blob,
+primary key(c1, c2(22), c3(22)))
+engine = innodb row_format = dynamic;
+insert into t1 values(1, repeat('A', 20000), repeat('B', 20000),
+repeat('C', 20000));
+update t1 set c3 = repeat('D', 20000) where c1 = 1;
+commit;
+select count(*) from t1 where c2 = repeat('A', 20000);
+count(*)
+1
+select count(*) from t1 where c3 = repeat('D', 20000);
+count(*)
+1
+select count(*) from t1 where c4 = repeat('C', 20000);
+count(*)
+1
+update t1 set c3 = repeat('E', 20000) where c1 = 1;
+drop table t1;
 set global innodb_file_format=`0`;
 select @@innodb_file_format;
 @@innodb_file_format
diff --git a/mysql-test/innodb-zip.test b/mysql-test/innodb-zip.test
index 2ddcaa82e25..c580dfd8119 100644
--- a/mysql-test/innodb-zip.test
+++ b/mysql-test/innodb-zip.test
@@ -100,6 +100,31 @@ INSERT INTO t1 VALUES(
 'FOXajs|.7@IR[dmv(2<FPZdnx+5?IS]gq{.8BLV`jt~1;EOYcmw*4>HR\fpz-7AKU_is}0:DNXblv)3=GQ[eoy,6@JT^hr|/9CMWaku(3>IT_ju)4?JU`kv*5@KValw+6ALWbmx,7BMXcny-8CNYdoz.9DOZep{/:EP[fq|0;FQ\gr}1<GR]hs~2=HS^it(4@LXdp|1=IUamy.:FR^jv+7CO[gs(4@LXdp|1=IUamy.:FR^jv+7CO[gs(4@LXdp|1=IUamy.:FR^jv+7CO[gs(5BO\iv,9FS`mz0=JWdq~4AN[hu+8ER_ly/<IVcp}3@MZgt*7DQ^kx.;HUbo|2?LYfs)6CP]jw-:GTan{1>KXer(6DR`n|3AO]ky0>LZhv-;IWes*8FTbp~5CQ_m{2@N\jx/=KYgu,:HVdr)7ESao}4BP^lz1?M[iw.<JXft+9GUcq(7FUds+:IXgv.=L[jy1@O^m|4CRap(7FUds+:IXgv.=L[jy1@O^m|4CRap(7FUds+:IXgv.=L[jy1@O^m|4CRap(8HXhx1AQaq*:JZjz3CScs,<L\l|5EUeu.>N^n~7GWgw0@P`p)9IYiy2BRbr+;K[k{4DTdt-=M]m}6FVfv/?O_o(9J[l}7HYj{5FWhy3DUfw1BSdu/@Qbs->O`q+<M^o):K\m~8IZk|6GXiz4EVgx2CTev0ARct.?Par,=N_p*;L]n(:L^p+=Oas.@Rdv1CUgy4FXj|7I[m(:L^p+=Oas.@Rdv1CUgy4FXj|7');
 drop table t1;
 
+#
+# Test blob column inheritance (mantis issue#36)
+#
+
+create table t1( c1 int not null, c2 blob, c3 blob, c4 blob,
+		primary key(c1, c2(22), c3(22)))
+		engine = innodb row_format = dynamic;
+
+insert into t1 values(1, repeat('A', 20000), repeat('B', 20000),
+			repeat('C', 20000));
+
+update t1 set c3 = repeat('D', 20000) where c1 = 1;
+commit;
+
+# one blob column which is unchanged in update and part of PK
+# one blob column which is changed and part of of PK
+# one blob column which is not part of PK and is unchanged
+select count(*) from t1 where c2 = repeat('A', 20000);
+select count(*) from t1 where c3 = repeat('D', 20000);
+select count(*) from t1 where c4 = repeat('C', 20000);
+
+update t1 set c3 = repeat('E', 20000) where c1 = 1;
+drop table t1;
+
+#
 #
 # Test innodb_file_format
 #
diff --git a/row/row0row.c b/row/row0row.c
index 9f2011c28f6..7953b4b41c2 100644
--- a/row/row0row.c
+++ b/row/row0row.c
@@ -97,12 +97,6 @@ row_build_index_entry(
 	} else {
 		dtuple_set_n_fields_cmp(
 			entry, dict_index_get_n_unique_in_tree(index));
-		if (dict_index_is_clust(index)) {
-			/* Do not fetch externally stored columns to
-			the clustered index.  Such columns are handled
-			at a higher level. */
-			ext = NULL;
-		}
 	}
 
 	for (i = 0; i < entry_len; i++) {
@@ -121,8 +115,15 @@ row_build_index_entry(
 
 		dfield_copy(dfield, dfield2);
 
-		if (dfield_is_null(dfield)) {
-		} else if (UNIV_LIKELY_NULL(ext)) {
+		if (dfield_is_null(dfield) || ind_field->prefix_len == 0) {
+			continue;
+		}
+
+		/* If a column prefix index, take only the prefix.
+		Prefix-indexed columns may be externally stored. */
+		ut_ad(col->ord_part);
+
+		if (UNIV_LIKELY_NULL(ext)) {
 			/* See if the column is stored externally. */
 			const byte*	buf = row_ext_lookup(ext, col_no,
 							     &len);
@@ -139,15 +140,10 @@ row_build_index_entry(
 			     || dict_index_is_clust(index));
 		}
 
-		/* If a column prefix index, take only the prefix */
-		if (ind_field->prefix_len > 0 && !dfield_is_null(dfield)) {
-			ut_ad(col->ord_part);
-			len = dtype_get_at_most_n_mbchars(
-				col->prtype, col->mbminlen, col->mbmaxlen,
-				ind_field->prefix_len,
-				len, dfield_get_data(dfield));
-			dfield_set_len(dfield, len);
-		}
+		len = dtype_get_at_most_n_mbchars(
+			col->prtype, col->mbminlen, col->mbmaxlen,
+			ind_field->prefix_len, len, dfield_get_data(dfield));
+		dfield_set_len(dfield, len);
 	}
 
 	ut_ad(dtuple_check_typed(entry));