Dirk Mahler created CALCITE-2696:
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Summary: Filter containing IN clause not passed to Enumerable.scan
Key: CALCITE-2696
URL: https://issues.apache.org/jira/browse/CALCITE-2696
Project: Calcite
Issue Type: Bug
Components: core
Affects Versions: 1.17.0
Reporter: Dirk Mahler
Assignee: Julian Hyde
I'm using the Calcite JDBC driver with an own SchemaFactory (defined by a model
property) that provides a schema containing a ProjectableFilterableTable:
{code:java}
String model = "inline:" //
+ "{" //
+ " version: '1.0', " //
+ " defaultSchema: 'test'," //
+ " schemas: [" //
+ " {" //
+ " name: 'test'," //
+ " type: 'custom'," //
+ " factory: '" + TestSchemaFactory.class.getName() + "'" //
+ " }"
+ " ]" //
+ "}";
Properties properties = new Properties();
properties.put(CalciteConnectionProperty.MODEL.camelName(), model);
connection = DriverManager.getConnection("jdbc:calcite:", properties);
{code}
{code:java}
class TestTable extends AbstractQueryableTable implements
ProjectableFilterableTable {
public Enumerable<Object[]> scan(DataContext root, List<RexNode> filters,
int[] projects) {
...
}
...
}{code}
It maps to a Java class and provides two Integer typed columns "value1" and
"value2".
The following query leads to a quite expensive behavior in the scan method if
the following statement is executed:
{code:java}
SELECT "value" FROM "TEST_TABLE" WHERE "value1" = 1 AND "value2" in
(1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20)
{code}
The scan method is invoked with a filter that only covers the part "value1" =
1, the IN clause is completely omitted. The result on the JDBC side is still
valid but in my case this still leads to a full scan of a large underlying data
set (millions of rows).
Interestingly the filter part reflecting the IN operator is provided if the
number of elements in the list is below 20. It seems that this is controlled by
org.apache.calcite.sql2rel.SqlToRelConverter.Config#getInSubQueryThreshold. It
would at be very helpful if this behavior could be confgiured on the JDBC
property level.
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