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NoSQL Database Server - supplies build and runtime support for the server (store) side of the Oracle NoSQL Database.
/*-
* Copyright (C) 2011, 2018 Oracle and/or its affiliates. All rights reserved.
*
* This file was distributed by Oracle as part of a version of Oracle NoSQL
* Database made available at:
*
* http://www.oracle.com/technetwork/database/database-technologies/nosqldb/downloads/index.html
*
* Please see the LICENSE file included in the top-level directory of the
* appropriate version of Oracle NoSQL Database for a copy of the license and
* additional information.
*/
package oracle.kv.impl.query.compiler;
import oracle.kv.impl.query.compiler.FunctionLib.FuncCode;
import oracle.kv.impl.query.runtime.ExistsIter;
import oracle.kv.impl.query.runtime.PlanIter;
import oracle.kv.impl.query.types.TypeManager;
/**
* If the input expr retursn NULL, the result is true.
*/
class FuncExists extends Function {
FuncExists(FuncCode code, String name) {
super(code, name,
TypeManager.ANY_STAR(),
TypeManager.BOOLEAN_ONE() /*retType*/);
}
@Override
public boolean mayReturnNULL(ExprFuncCall caller) {
return false;
}
@Override
PlanIter codegen(
CodeGenerator codegen,
ExprFuncCall caller,
PlanIter[] argIters) {
int resultReg = codegen.allocateResultReg(caller);
return new ExistsIter(caller, resultReg, theCode, argIters[0]);
}
}
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