Konstantin Orlov created IGNITE-26636:
-----------------------------------------
Summary: Introduce basic API for expression execution and
predicate implementation
Key: IGNITE-26636
URL: https://issues.apache.org/jira/browse/IGNITE-26636
Project: Ignite
Issue Type: Improvement
Components: sql ai3
Reporter: Konstantin Orlov
Let's introduce basic set of interfaces and simple implementation of one
expression.
The proposed API is as follow:
{code}
/**
* A context enclosing information for a context-dependent function, such
* as CURRENT_USER, CURRENT_TIMESTAMP, etc.
*/
public interface EvaluationContext {
EvaluationContext EMPTY = new EvaluationContext() {};
}
/**
* Class representing a reader for the input row.
*
* @param <RowT> Type of the supported row.
*/
@FunctionalInterface
public interface RowFieldAccessor<RowT> {
/** Reads the specified field of the given row. */
@Nullable Object get(int field, RowT row);
}
@FunctionalInterface
public interface IgnitePredicate {
<RowT> boolean test(
EvaluationContext context,
RowFieldAccessor<RowT> accessor,
RowT row
);
}
public interface IgniteExpressionFactory {
/**
* Creates predicate which accepts a single row as input.
*
* @param expression String representation of expression to create.
* @param inputRowType A type of the input row.
* @return A predicate representing the provided expression.
*/
IgnitePredicate predicate(
String expression,
RowNativeType inputRowType
);
}
{code}
h3. Definition of Done
It's possible to execute arbitrary expression over a provided row. All types
should be supported. Validation exceptions should have reasonable message.
Runtime exceptions (e.g. division by zero) should have reasonable message.
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