Vladimir Sitnikov created CALCITE-501:
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Summary: Implement indexed access paths in ReflectiveSchema
Key: CALCITE-501
URL: https://issues.apache.org/jira/browse/CALCITE-501
Project: Calcite
Issue Type: Bug
Affects Versions: 1.0.0-incubating
Reporter: Vladimir Sitnikov
Assignee: Julian Hyde
{{ReflectiveSchema}} is not able to perform indexed scan of a particular
collection.
It would be nice if it could find rows by a given key.
This would demonstrate the way to implement indexed access path in Calcite:
rules, filter matching.
The sketch API can be as follows:
{code:java}
public static class CatchallSchema {
public final Employee[] employees = {
new Employee(1, 10, "A", 0f, null),
new Employee(2, 10, "Ab", 0f, null),
new Employee(3, 10, "Abc", 0f, null),
new Employee(4, 10, "Abd", 0f, null),
};
// Return the data
public Employee[] findEmployeesByName(String name);
// or
// List of indices into "employees" collection
public int[] findEmployeesByName(String name);
}
{code}
Alternative solution is to treat {{Map/SortedMap}} somehow in a special way.
{code:java}
// When Filter(name=?, Scan) can be transformed to MapGet(name=?)
public Map<String, Employee> employees;
{code}
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