=== modified file 'bin/pt-online-schema-change'
--- bin/pt-online-schema-change	2014-07-04 17:16:08 +0000
+++ bin/pt-online-schema-change	2014-07-21 19:44:47 +0000
@@ -8872,7 +8872,7 @@
                   index        => $nibble_iter->nibble_index(),
                   n_index_cols => $o->get('chunk-index-columns'),
                );
-               if ( !$key || lc($key) ne lc($nibble_iter->nibble_index()) ) {
+               if ( !$key || lc($key) ne lc($nibble_iter->nibble_index()) and $o->get('check-plan') ) {
                   die ts("Cannot determine the key_len of the chunk index "
                      . "because MySQL chose "
                      . ($key ? "the $key" : "no") . " index "
@@ -8913,7 +8913,7 @@
             sth  => $sth->{explain_upper_boundary},
             vals => [ @{$boundary->{lower}}, $nibble_iter->limit() ],
          );
-         if (lc($expl->{key} || '') ne lc($nibble_iter->nibble_index() || '')) {
+         if (lc($expl->{key} || '') ne lc($nibble_iter->nibble_index() || '') and $o->get('check-plan')) {
             my $msg
                = "Aborting copying table $tbl->{name} at chunk "
                . ($nibble_iter->nibble_number() + 1)
@@ -9533,7 +9533,7 @@
 
    # Ensure that MySQL is using the chunk index if the table is being chunked.
    if ( !$nibble_iter->one_nibble()
-        && lc($expl->{key} || '') ne lc($nibble_iter->nibble_index() || '') )
+        && lc($expl->{key} || '') ne lc($nibble_iter->nibble_index() || '') and $o->get('check-plan'))
    {
       die ts("Error copying rows at chunk " . $nibble_iter->nibble_number()
          . " of $tbl->{db}.$tbl->{tbl} because MySQL chose "