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MDEV-11321: MariaRocks: type_binary_indexes, type_blob_indexes fail

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... due to different index statistics
Make statistics calculations in MariaRocks produce the same values
that MyRocks produces.

Added a comment in rdb_datadic.cc
This commit is contained in:
Sergei Petrunia
2016-12-02 21:08:08 +00:00
parent 7f43f736ac
commit d903396c18
2 changed files with 21 additions and 2 deletions
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16
storage/rocksdb/ha_rocksdb.cc
View File

@@ -8464,11 +8464,25 @@ int ha_rocksdb::info(uint flag)
if ((x == 0 && rocksdb_debug_optimizer_no_zero_cardinality) ||
rocksdb_debug_optimizer_n_rows > 0)
{
/*
Make MariaRocks behave the same way as MyRocks does:
1. SQL layer thinks that unique secondary indexes are not extended
with PK columns (both in MySQL and MariaDB)
2. MariaDB also thinks that indexes with partially-covered columns
are not extended with PK columns. Use the same number of
keyparts that MyRocks would use.
*/
uint ext_key_parts2;
if (k->flags & HA_NOSAME)
ext_key_parts2= k->ext_key_parts; // This is #1
else
ext_key_parts2= m_key_descr_arr[i]->get_key_parts(); // This is #2.
// Fake cardinality implementation. For example, (idx1, idx2, idx3) index
// will have rec_per_key for (idx1)=4, (idx1,2)=2, and (idx1,2,3)=1.
// rec_per_key for the whole index is 1, and multiplied by 2^n if
// n suffix columns of the index are not used.
x = 1 << (k->ext_key_parts-j-1);
x = 1 << (ext_key_parts2-j-1);
}
k->rec_per_key[j]= x;
}

7
storage/rocksdb/rdb_datadic.cc
View File

@@ -283,7 +283,12 @@ void Rdb_key_def::setup(const TABLE *tbl, const Rdb_tbl_def *tbl_def)
key_part++;
/*
For "unique" secondary indexes, pretend they have
"index extensions"
"index extensions".
MariaDB also has this property: if an index has a partially-covered
column like KEY(varchar_col(N)), then the SQL layer will think it is
not "extended" with PK columns. The code below handles this case,
also.
*/
if (secondary_key && src_i+1 == key_info->ext_key_parts)
{