content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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 org.apache.asterix.algebra.operators.physical;
  
  import java.util.List;
  
  import org.apache.asterix.common.exceptions.CompilationException;
  import org.apache.asterix.common.exceptions.ErrorCode;
  import org.apache.asterix.external.library.ExternalFunctionDescriptorProvider;
  import org.apache.asterix.external.operators.ExternalAssignBatchRuntimeFactory;
  import org.apache.asterix.metadata.functions.ExternalFunctionCompilerUtil;
  import org.apache.asterix.om.functions.IExternalFunctionDescriptor;
  import org.apache.commons.lang3.mutable.Mutable;
  import org.apache.hyracks.algebricks.common.exceptions.AlgebricksException;
  import org.apache.hyracks.algebricks.core.algebra.base.ILogicalExpression;
  import org.apache.hyracks.algebricks.core.algebra.base.LogicalExpressionTag;
  import org.apache.hyracks.algebricks.core.algebra.base.LogicalVariable;
  import org.apache.hyracks.algebricks.core.algebra.base.PhysicalOperatorTag;
  import org.apache.hyracks.algebricks.core.algebra.expressions.AbstractFunctionCallExpression;
  import org.apache.hyracks.algebricks.core.algebra.expressions.IVariableTypeEnvironment;
  import org.apache.hyracks.algebricks.core.algebra.expressions.VariableReferenceExpression;
  import org.apache.hyracks.algebricks.core.algebra.functions.IFunctionInfo;
  import org.apache.hyracks.algebricks.core.algebra.operators.AbstractAssignPOperator;
  import org.apache.hyracks.algebricks.core.algebra.operators.logical.AssignOperator;
  import org.apache.hyracks.algebricks.core.algebra.operators.logical.IOperatorSchema;
  import org.apache.hyracks.algebricks.core.jobgen.impl.JobGenContext;
  import org.apache.hyracks.algebricks.runtime.base.IPushRuntimeFactory;
  import org.apache.hyracks.api.exceptions.SourceLocation;
  
  public final class AssignBatchPOperator extends AbstractAssignPOperator {
  
      @Override
      public PhysicalOperatorTag getOperatorTag() {
          return PhysicalOperatorTag.ASSIGN_BATCH;
      }
  
      @Override
      protected IPushRuntimeFactory createRuntimeFactory(JobGenContext context, AssignOperator op,
              IOperatorSchema opSchema, IOperatorSchema[] inputSchemas, int[] outColumns, int[] projectionList)
              throws AlgebricksException {
          IVariableTypeEnvironment inputTypeEnv = context.getTypeEnvironment(op.getInputs().get(0).getValue());
          List<Mutable<ILogicalExpression>> exprList = op.getExpressions();
          int exprCount = exprList.size();
          IExternalFunctionDescriptor[] fnDescs = new IExternalFunctionDescriptor[exprCount];
          int[][] fnArgColumns = new int[exprCount][];
          for (int i = 0; i < exprCount; i++) {
              Mutable<ILogicalExpression> exprRef = exprList.get(i);
              ILogicalExpression expr = exprRef.getValue();
              if (expr.getExpressionTag() != LogicalExpressionTag.FUNCTION_CALL) {
                  throw new CompilationException(ErrorCode.COMPILATION_ILLEGAL_STATE, op.getSourceLocation(),
                          String.valueOf(expr.getExpressionTag()));
              }
              AbstractFunctionCallExpression callExpr = (AbstractFunctionCallExpression) expr;
              IFunctionInfo fi = callExpr.getFunctionInfo();
              if (!ExternalFunctionCompilerUtil.supportsBatchInvocation(callExpr.getKind(), fi)) {
                  throw new CompilationException(ErrorCode.COMPILATION_ILLEGAL_STATE, op.getSourceLocation(),
                          fi.toString());
              }
              fnDescs[i] = ExternalFunctionDescriptorProvider.resolveExternalFunction(callExpr, inputTypeEnv, context);
              fnArgColumns[i] = getColumns(callExpr.getArguments(), inputSchemas[0], op.getSourceLocation());
          }
  
          return new ExternalAssignBatchRuntimeFactory(outColumns, fnDescs, fnArgColumns, projectionList);
      }
  
      private int[] getColumns(List<Mutable<ILogicalExpression>> exprList, IOperatorSchema inputSchema,
              SourceLocation sourceLoc) throws CompilationException {
          int n = exprList.size();
          int[] columns = new int[n];
          for (int i = 0; i < n; i++) {
              ILogicalExpression expr = exprList.get(i).getValue();
              if (expr.getExpressionTag() != LogicalExpressionTag.VARIABLE) {
                  throw new CompilationException(ErrorCode.COMPILATION_ILLEGAL_STATE, sourceLoc,
                          String.valueOf(expr.getExpressionTag()));
              }
              VariableReferenceExpression argVarRef = (VariableReferenceExpression) expr;
              LogicalVariable argVar = argVarRef.getVariableReference();
              int argColumn = inputSchema.findVariable(argVar);
              if (argColumn < 0) {
                  throw new CompilationException(ErrorCode.COMPILATION_ILLEGAL_STATE, sourceLoc, String.valueOf(argVar));
              }
              columns[i] = argColumn;
          }
          return columns;
      }
  }
  