private ISearchField getProjectionField(ParseQueryNode projectNode) {
if (nodeProjectField.containsKey(projectNode)) {
return nodeProjectField.get(projectNode);
}
ISearchField field = null;
// make sure the sub-query has only one user projection
Collection<ISearchField> searchFields = projectNode.getUserProjection().getFields();
boolean noUserSpecifyProject =
projectNode.getUserProjection().hasStar() || projectNode.getUserProjection().isEmpty();
if (noUserSpecifyProject) {
if (isTargetReference) {
// use the _oid when not specific user projection given for target reference. _oid is the
// mandatory internal project
searchFields.add(
new ProjectionField(
projectNode.getMetaClass().getFieldByName(InternalFieldEnum.ID.getName()),
true,
queryContext.getRegistration().searchStrategy));
} else {
searchFields = projectNode.getProjection().getFields();
}
}
if (searchFields.size() > 1) {
throw new QueryExecuteException(
QueryErrCodeEnum.IILEGAL_PROJECTION,
MessageFormat.format(
"sub query could only have one root projection, but actually get {0} fields!",
searchFields.size()));
}
field = searchFields.iterator().next();
nodeProjectField.put(projectNode, field);
return field;
}
static boolean isRelationshipField(ISearchField field) {
if (AbstractSearchField.class.isInstance(field)) {
AbstractSearchField selection = (AbstractSearchField) field;
return selection.getRootField().getDataType().equals(DataTypeEnum.RELATIONSHIP)
&& (selection.getInnerField() == null
|| selection.getInnerField().equals(InternalFieldEnum.ID.getDbName()));
}
return false;
}
@Override
public boolean isIndexUsable(ISearchField field, MetaClass metaClass) {
Collection<IndexInfo> indexes = metaClass.getIndexesOnField(field.getFieldName());
for (IndexInfo index : indexes) {
String firstKey = index.getKeyList().get(0);
MetaField metaField = metaClass.getFieldByName(firstKey);
String physicalKeyName = getFieldValueName(metaField);
if (metaField.getDataType().equals(DataTypeEnum.RELATIONSHIP)) {
physicalKeyName =
metaField.getFlattenValueDbName()
+ AbstractEntityIDHelper.DOT
+ InternalFieldEnum.ID.getDbName();
}
if (physicalKeyName.equals(field.getFullDbName())) {
return true;
}
}
return false;
}