From da7af481cda9d0fb836f010d421ce00830b69f56 Mon Sep 17 00:00:00 2001 From: unknown Date: Thu, 19 Oct 2006 12:52:37 +0500 Subject: Fix for bug #20732: Partial index and long sjis search with '>' fails sometimes We miss some records sometimes using RANGE method if we have partial key segments. Example: Create table t1(a char(2), key(a(1))); insert into t1 values ('a'), ('xx'); select a from t1 where a > 'x'; We call index_read() passing 'x' key and HA_READ_AFTER_KEY flag in the handler::read_range_first() wich is wrong because we have a partial key segment for the field and might miss records like 'xx'. Fix: don't use open segments in such a case. mysql-test/r/range.result: Fix for bug #20732: Partial index and long sjis search with '>' fails sometimes - test result. mysql-test/t/range.test: Fix for bug #20732: Partial index and long sjis search with '>' fails sometimes - test case. sql/opt_range.cc: Fix for bug #20732: Partial index and long sjis search with '>' fails sometimes - check if we have a partial key segment for a Item_func::GT_FUNC; if so, don't set NEAR_MIN flag in order to use HA_READ_KEY_OR_NEXT instead of HA_READ_AFTER_KEY. sql/opt_range.h: Fix for bug #20732: Partial index and long sjis search with '>' fails sometimes - key segment 'flag' slot added. sql/sql_select.cc: Fix for bug #20732: Partial index and long sjis search with '>' fails sometimes - test (HA_PART_KEY_SEG | HA_NULL_PART) as we split it in the sql/table.cc sql/table.cc: Fix for bug #20732: Partial index and long sjis search with '>' fails sometimes - set HA_NULL_PART flag instead of HA_PART_KEY_SEG in order not to mix them. --- sql/opt_range.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'sql/opt_range.h') diff --git a/sql/opt_range.h b/sql/opt_range.h index 367a85dc6f2..4d425604921 100644 --- a/sql/opt_range.h +++ b/sql/opt_range.h @@ -36,7 +36,7 @@ typedef struct st_key_part { uint16 key,part, store_length, length; - uint8 null_bit; + uint8 null_bit, flag; Field *field; Field::imagetype image_type; } KEY_PART; -- cgit v1.2.1