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 /*
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *     http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.facebook.presto.sql.gen;
import static com.facebook.presto.sql.gen.ByteCodeUtils.invoke;
        implements ByteCodeGenerator
    @Override
    public ByteCodeNode generateExpression(Signature signatureByteCodeGeneratorContext generatorContextType returnTypeList<RowExpressionarguments)
    {
        Preconditions.checkArgument(arguments.size() == 2);
        CompilerContext context = generatorContext.getContext();
        RowExpression left = arguments.get(0);
        RowExpression right = arguments.get(1);
        Type leftType = left.getType();
        Type rightType = right.getType();
        FunctionInfo operator = generatorContext
                .getRegistry()
                .resolveOperator(., ImmutableList.of(leftTyperightType));
        Binding binding = generatorContext
                .getCallSiteBinder()
                .bind(operator.getMethodHandle());
        ByteCodeNode equalsCall = new Block(context)
                .comment("equals(%s, %s)"leftTyperightType)
                .append(invoke(generatorContext.getContext(), bindingoperator.getSignature()));
        Block block = new Block(context)
                .comment("IS DISTINCT FROM")
                .comment("left")
                .append(generatorContext.generate(left))
                .append(new IfStatement(context,
                        new Block(context).getVariable("wasNull"),
                        new Block(context)
                                .pop(leftType.getJavaType())
                                .putVariable("wasNull"false)
                                .comment("right is not null")
                                .append(generatorContext.generate(right))
                                .pop(rightType.getJavaType())
                                .getVariable("wasNull")
                                .invokeStatic(CompilerOperations.class"not"boolean.classboolean.class),
                        new Block(context)
                                .comment("right")
                                .append(generatorContext.generate(right))
                                .append(new IfStatement(context,
                                        new Block(context).getVariable("wasNull"),
                                        new Block(context)
                                                .pop(leftType.getJavaType())
                                                .pop(rightType.getJavaType())
                                                .push(true),
                                        new Block(context)
                                                .append(equalsCall)
                                                .invokeStatic(CompilerOperations.class"not"boolean.classboolean.class)))))
                .putVariable("wasNull"false);
        return block;
    }
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