/** 把query中的avg换成count，sum */
@Override
public IDataNodeExecutor optimize(
IDataNodeExecutor dne,
Map<Integer, ParameterContext> parameterSettings,
Map<String, Object> extraCmd) {
if (dne instanceof IMerge && ((IMerge) dne).getSubNode().size() > 1) {
for (IDataNodeExecutor sub : ((IMerge) dne).getSubNode()) {
expendAvgFunction(sub);
}
for (IDataNodeExecutor sub : ((IMerge) dne).getSubNode()) {
this.optimize(sub, parameterSettings, extraCmd);
}
} else if (dne instanceof IJoin) {
IJoin join = (IJoin) dne;
// join函数，采取map模式，不需要处理avg展开
// 递归处理子节点
this.optimize(join.getLeftNode(), parameterSettings, extraCmd);
this.optimize(join.getRightNode(), parameterSettings, extraCmd);
} else if (dne instanceof IQuery) {
IQuery query = (IQuery) dne;
// 如果是子查询,采取map模式，不需要处理avg展开
if (query.isSubQuery()) {
this.optimize(query.getSubQuery(), parameterSettings, extraCmd); // 递归处理子节点
}
}
return dne;
}
@Override
public IBlockNestedLoopCursor blockNestedLoopJoinCursor(
ExecutionContext executionContext,
ISchematicCursor left_cursor,
ISchematicCursor right_cursor,
List left_columns,
List right_columns,
List columns,
IJoin join)
throws TddlException {
try {
return new BlockNestedtLoopCursor(
left_cursor,
right_cursor,
left_columns,
right_columns,
columns,
this,
join,
executionContext,
join.getLeftNode().getColumns(),
join.getRightNode().getColumns());
} catch (Exception e) {
closeParentCursor(left_cursor);
closeParentCursor(right_cursor);
throw new TddlException(e);
}
}
@Override
public IIndexNestLoopCursor indexNestLoopCursor(
ExecutionContext executionContext,
ISchematicCursor leftCursor,
ISchematicCursor rightCursor,
List leftColumns,
List rightColumns,
List columns,
boolean prefix,
IJoin executor)
throws TddlException {
try {
return new IndexNestedLoopMgetImpCursor(
leftCursor,
rightCursor,
leftColumns,
rightColumns,
columns,
prefix,
executor.getLeftNode().getColumns(),
executor.getRightNode().getColumns(),
executor,
executionContext);
} catch (Exception e) {
closeParentCursor(leftCursor);
closeParentCursor(rightCursor);
throw new TddlException(e);
}
}
// 两表Join查询，右表连接键为主键，右表为主键查询
// 开启了join merge join
// 右表虽然为二级索引的查询，但Join列不是索引列，应该选择NestLoop
// 会是一个table1 join ( table2 index join table2 key )的多级join
@Test
public void test_两表Join_主键_存在二级索引条件() {
TableNode table = new TableNode("TABLE1");
JoinNode join = table.join("TABLE2", "ID", "ID");
join.query("TABLE2.NAME = 1");
IQueryTree qc = (IQueryTree) optimizer.optimizeAndAssignment(join, null, extraCmd);
Assert.assertTrue(qc instanceof IMerge);
Assert.assertTrue(((IMerge) qc).getSubNodes().get(0) instanceof IJoin);
IJoin subJoin = (IJoin) ((IMerge) qc).getSubNodes().get(0);
Assert.assertTrue(subJoin.getRightNode() instanceof IJoin);
Assert.assertEquals(JoinStrategy.NEST_LOOP_JOIN, subJoin.getJoinStrategy());
}