@Override
public Matcher visit(IsNull isNull) {
return isNull
.getField()
.accept(
new VisitorAdapter<Matcher>() {
@Override
public Matcher visit(final Field field) {
return new Matcher() {
@Override
public boolean match(DataRecord record) {
return record.get(field.getFieldMetadata()) == null;
}
};
}
@Override
public Matcher visit(StagingBlockKey stagingBlockKey) {
return new Matcher() {
@Override
public boolean match(DataRecord record) {
return record
.getRecordMetadata()
.getRecordProperties()
.get(StagingStorage.METADATA_STAGING_BLOCK_KEY)
== null;
}
};
}
});
}
@Override
public void visit(IsNull obj) {
visitNode(obj.getExpression());
Column column = (Column) onGoingExpression.pop();
// this will never be part of the rowid, as it can never be null, so scan
this.doScanEvaluation = true;
}
@SuppressWarnings("rawtypes")
public static FilterConditionContext visit(
IsNull obj, QueryBuilder queryBuilder, FilterConditionBeginContext fcbc) {
LogManager.logTrace(LogConstants.CTX_CONNECTOR, "Parsing IsNull criteria."); // $NON-NLS-1$
Expression exp = obj.getExpression();
Column c = ((ColumnReference) exp).getMetadataObject();
if (fcbc == null) {
if (obj.isNegated()) {
return queryBuilder.not().having(c.getSourceName()).isNull();
}
return queryBuilder.having(c.getSourceName()).isNull();
}
if (obj.isNegated()) {
return fcbc.not().having(c.getSourceName()).isNull();
}
return fcbc.having(c.getSourceName()).isNull();
}