Add Index.joinType for the group index processing.
Add Index.joinType for the group index processing.
shunwang/sql-layer-1,shunwang/sql-layer-1,jaytaylor/sql-layer,relateiq/sql-layer,wfxiang08/sql-layer-1,ngaut/sql-layer,wfxiang08/sql-layer-1,shunwang/sql-layer-1,jaytaylor/sql-layer,qiuyesuifeng/sql-layer,relateiq/sql-layer,qiuyesuifeng/sql-layer,relateiq/sql-layer,ngaut/sql-layer,jaytaylor/sql-layer,wfxiang08/sql-layer-1,wfxiang08/sql-layer-1,qiuyesuifeng/sql-layer,relateiq/sql-layer,qiuyesuifeng/sql-layer,ngaut/sql-layer,jaytaylor/sql-layer,ngaut/sql-layer,shunwang/sql-layer-1