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-rw-r--r--myisam/mi_open.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/myisam/mi_open.c b/myisam/mi_open.c
index ec169ac8785..5314d6a9a6c 100644
--- a/myisam/mi_open.c
+++ b/myisam/mi_open.c
@@ -791,8 +791,17 @@ static void setup_key_functions(register MI_KEYDEF *keyinfo)
keyinfo->get_key= _mi_get_pack_key;
if (keyinfo->seg[0].flag & HA_PACK_KEY)
{ /* Prefix compression */
+ /*
+ _mi_prefix_search() compares end-space against ASCII blank (' ').
+ It cannot be used for character sets, that do not encode the
+ blank character like ASCII does. UCS2 is an example. All
+ character sets with a fixed width > 1 or a mimimum width > 1
+ cannot represent blank like ASCII does. In these cases we have
+ to use _mi_seq_search() for the search.
+ */
if (!keyinfo->seg->charset || use_strnxfrm(keyinfo->seg->charset) ||
- (keyinfo->seg->flag & HA_NULL_PART))
+ (keyinfo->seg->flag & HA_NULL_PART) ||
+ (keyinfo->seg->charset->mbminlen > 1))
keyinfo->bin_search=_mi_seq_search;
else
keyinfo->bin_search=_mi_prefix_search;