hustjieke

ping @zsp108

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FIx it in stonedb-5.7 first.

Fixed.

ping @gougexuanli

Check if related to #232 ? There are many keys in create schema.

Add variable defined in cmake, like: ``` # begin to build cmake ../../ \ -DCMAKE_BUILD_TYPE=${build_type} \ -DCMAKE_INSTALL_PREFIX=${install_target} \ -DMYSQL_DATADIR=${install_target}/data \ -DSYSCONFDIR=${install_target} \ -DMYSQL_UNIX_ADDR=${install_target}/tmp/mysql.sock \ -DWITH_EMBEDDED_SERVER=OFF \ -DWITH_STONEDB_STORAGE_ENGINE=1 \ -DWITH_MYISAM_STORAGE_ENGINE=1 \...

``` #lihao Here, the dependency libs will be moved to 'third_party' directory. SET(BOOST_ROOT ${WITH_BOOST}) SET(MARISA_ROOT /usr/local/stonedb-marisa) SET(ROCKSDB_ROOT /usr/local/stonedb-gcc-rocksdb) ``` had been resolved in #11

I think we should check the length in primary key just innodb does.

Add the usage of `Delete SQL syntax` to `StoneDB docs`.