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MCOL-657 Support the <=> operator

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This converts <=> into "a = b OR (a IS NULL AND b IS NULL)"
This commit is contained in:
Andrew Hutchings
2017-05-09 11:57:28 +01:00
parent ad1c6e49f0
commit 4f3968fb36
1 changed files with 40 additions and 1 deletions
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41
dbcon/mysql/ha_calpont_execplan.cpp
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@ -1392,6 +1392,44 @@ bool buildPredicateItem(Item_func* ifp, gp_walk_info* gwip)
gwip->ptWorkStack.push(pt);
#endif
}
else if (ifp->functype() == Item_func::EQUAL_FUNC)
{
// a = b OR (a IS NULL AND b IS NULL)
idbassert (gwip->rcWorkStack.size() >= 2);
ReturnedColumn* rhs = gwip->rcWorkStack.top();
gwip->rcWorkStack.pop();
ReturnedColumn* lhs = gwip->rcWorkStack.top();
gwip->rcWorkStack.pop();
SimpleFilter* sfn1 = 0;
SimpleFilter* sfn2 = 0;
SimpleFilter* sfo = 0;
// b IS NULL
ConstantColumn *nlhs1 = new ConstantColumn("", ConstantColumn::NULLDATA);
sop.reset(new PredicateOperator("isnull"));
sop->setOpType(lhs->resultType(), rhs->resultType());
sfn1 = new SimpleFilter(sop, rhs, nlhs1);
ParseTree* ptpl = new ParseTree(sfn1);
// a IS NULL
ConstantColumn *nlhs2 = new ConstantColumn("", ConstantColumn::NULLDATA);
sop.reset(new PredicateOperator("isnull"));
sop->setOpType(lhs->resultType(), rhs->resultType());
sfn2 = new SimpleFilter(sop, lhs, nlhs2);
ParseTree* ptpr = new ParseTree(sfn2);
// AND them both
ParseTree* ptpn = new ParseTree(new LogicOperator("and"));
ptpn->left(ptpl);
ptpn->right(ptpr);
// a = b
sop.reset(new PredicateOperator("="));
sop->setOpType(lhs->resultType(), lhs->resultType());
sfo = new SimpleFilter(sop, lhs->clone(), rhs->clone());
// OR with the NULL comparison tree
ParseTree* ptp = new ParseTree(new LogicOperator("or"));
ptp->left(sfo);
ptp->right(ptpn);
gwip->ptWorkStack.push(ptp);
return true;
}
else //std rel ops (incl "like")
{
if (gwip->rcWorkStack.size() < 2)
@ -3035,7 +3073,8 @@ ReturnedColumn* buildFunctionColumn(Item_func* ifp, gp_walk_info& gwi, bool& non
ifp->functype() == Item_func::IN_FUNC ||
ifp->functype() == Item_func::ISNULL_FUNC ||
ifp->functype() == Item_func::ISNOTNULL_FUNC ||
ifp->functype() == Item_func::NOT_FUNC)
ifp->functype() == Item_func::NOT_FUNC ||
ifp->functype() == Item_func::EQUAL_FUNC)
{
return NULL;
}