@Override
public void handle(
final AST2BOpContext context,
final QueryRoot queryRoot,
final QueryHintScope scope,
final ASTBase op,
final Boolean value) {
if (scope == QueryHintScope.Query) {
context.mergeJoin = value;
return;
}
throw new QueryHintException(scope, op, getName(), value);
}
private void liftSparql11Subquery(
final AST2BOpContext context, final StaticAnalysis sa, final SubqueryRoot subqueryRoot) {
final IGroupNode<?> parent = subqueryRoot.getParent();
final String newName = "-subSelect-" + context.nextId();
final NamedSubqueryInclude include = new NamedSubqueryInclude(newName);
/**
* Set query hints from the parent join group.
*
* @see <a href="http://sourceforge.net/apps/trac/bigdata/ticket/791" > Clean up query hints
* </a>
*/
include.setQueryHints((Properties) parent.getProperty(ASTBase.Annotations.QUERY_HINTS));
/**
* Copy across attached join filters.
*
* @see <a href="https://sourceforge.net/apps/trac/bigdata/ticket/796" >Filter assigned to
* sub-query by query generator is dropped from evaluation</a>
*/
include.setAttachedJoinFilters(subqueryRoot.getAttachedJoinFilters());
/*
* Note: A SubqueryRoot normally starts out as the sole child of a
* JoinGroupNode. However, other rewrites may have written out that
* JoinGroupNode and it does not appear to be present for an ASK
* subquery.
*
* Therefore, when the parent of the SubqueryRoot is a JoinGroupNode
* having the SubqueryRoot as its only child, we use the parent's parent
* in order to replace the JoinGroupNode when we lift out the
* SubqueryRoot. Otherwise we use the parent since there is no wrapping
* JoinGroupNode (or if there is, it has some other stuff in there as
* well).
*
* BLZG-1542 -> there is an additional thing we need to take care of:
* whenever the parent node is an OPTIONAL or MINUS, we
* must not remove it, otherwise we would just "drop" an
* OPTIONAL or MINUS, thus changing the query's semantics
*
*/
if ((parent instanceof JoinGroupNode)
&& !((JoinGroupNode) parent).isOptional()
&& !((JoinGroupNode) parent).isMinus()
&& ((BOp) parent).arity() == 1
&& parent.getParent() != null
&& !((IGroupNode<?>) parent.getParent() instanceof UnionNode)) {
final IGroupNode<IGroupMemberNode> pp = parent.getParent();
// Replace the sub-select with the include.
if (((ASTBase) pp).replaceWith((BOp) parent, include) == 0) throw new AssertionError();
} else {
// Replace the sub-select with the include.
if (((ASTBase) parent).replaceWith((BOp) subqueryRoot, include) == 0)
throw new AssertionError();
}
final NamedSubqueryRoot nsr = new NamedSubqueryRoot(subqueryRoot.getQueryType(), newName);
/**
* Copy across query hints from the original subquery.
*
* @see <a href="http://sourceforge.net/apps/trac/bigdata/ticket/791" > Clean up query hints
* </a>
*/
nsr.setQueryHints(subqueryRoot.getQueryHints());
nsr.setConstruct(subqueryRoot.getConstruct());
nsr.setGroupBy(subqueryRoot.getGroupBy());
nsr.setHaving(subqueryRoot.getHaving());
nsr.setOrderBy(subqueryRoot.getOrderBy());
nsr.setProjection(subqueryRoot.getProjection());
nsr.setSlice(subqueryRoot.getSlice());
nsr.setWhereClause(subqueryRoot.getWhereClause());
nsr.setBindingsClause(subqueryRoot.getBindingsClause());
sa.getQueryRoot().getNamedSubqueriesNotNull().add(nsr);
}