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/*
 * 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 com.hazelcast.org.apache.calcite.adapter.enumerable;

import com.hazelcast.org.apache.calcite.linq4j.function.Experimental;
import com.hazelcast.org.apache.calcite.linq4j.tree.BlockBuilder;
import com.hazelcast.org.apache.calcite.linq4j.tree.Expression;
import com.hazelcast.org.apache.calcite.linq4j.tree.Expressions;
import com.hazelcast.org.apache.calcite.plan.RelOptCluster;
import com.hazelcast.org.apache.calcite.plan.RelOptTable;
import com.hazelcast.org.apache.calcite.plan.RelTraitSet;
import com.hazelcast.org.apache.calcite.rel.RelCollationTraitDef;
import com.hazelcast.org.apache.calcite.rel.RelDistributionTraitDef;
import com.hazelcast.org.apache.calcite.rel.RelNode;
import com.hazelcast.org.apache.calcite.rel.core.Spool;
import com.hazelcast.org.apache.calcite.rel.core.TableSpool;
import com.hazelcast.org.apache.calcite.rel.metadata.RelMetadataQuery;
import com.hazelcast.org.apache.calcite.schema.ModifiableTable;
import com.hazelcast.org.apache.calcite.util.BuiltInMethod;

/**
 * Implementation of {@link TableSpool} in
 * {@link EnumerableConvention enumerable calling convention}
 * that writes into a {@link ModifiableTable} (which must exist in the current
 * schema).
 *
 * 

NOTE: The current API is experimental and subject to change without * notice. */ @Experimental public class EnumerableTableSpool extends TableSpool implements EnumerableRel { private EnumerableTableSpool(RelOptCluster cluster, RelTraitSet traitSet, RelNode input, Type readType, Type writeType, RelOptTable table) { super(cluster, traitSet, input, readType, writeType, table); } /** Creates an EnumerableTableSpool. */ public static EnumerableTableSpool create(RelNode input, Type readType, Type writeType, RelOptTable table) { RelOptCluster cluster = input.getCluster(); RelMetadataQuery mq = cluster.getMetadataQuery(); RelTraitSet traitSet = cluster.traitSetOf(EnumerableConvention.INSTANCE) .replaceIfs(RelCollationTraitDef.INSTANCE, () -> mq.collations(input)) .replaceIf(RelDistributionTraitDef.INSTANCE, () -> mq.distribution(input)); return new EnumerableTableSpool(cluster, traitSet, input, readType, writeType, table); } @Override public Result implement(EnumerableRelImplementor implementor, Prefer pref) { // TODO for the moment only LAZY read & write is supported if (readType != Type.LAZY || writeType != Type.LAZY) { throw new UnsupportedOperationException( "EnumerableTableSpool supports for the moment only LAZY read and LAZY write"); } // ModifiableTable t = (ModifiableTable) root.getRootSchema().getTable(tableName); // return lazyCollectionSpool(t.getModifiableCollection(), ); BlockBuilder builder = new BlockBuilder(); RelNode input = getInput(); Result inputResult = implementor.visitChild(this, 0, (EnumerableRel) input, pref); String tableName = table.getQualifiedName().get(table.getQualifiedName().size() - 1); Expression tableExp = Expressions.convert_( Expressions.call( Expressions.call( implementor.getRootExpression(), BuiltInMethod.DATA_CONTEXT_GET_ROOT_SCHEMA.method), BuiltInMethod.SCHEMA_GET_TABLE.method, Expressions.constant(tableName, String.class)), ModifiableTable.class); Expression collectionExp = Expressions.call( tableExp, BuiltInMethod.MODIFIABLE_TABLE_GET_MODIFIABLE_COLLECTION.method); Expression inputExp = builder.append("input", inputResult.block); Expression spoolExp = Expressions.call( BuiltInMethod.LAZY_COLLECTION_SPOOL.method, collectionExp, inputExp); builder.add(spoolExp); PhysType physType = PhysTypeImpl.of( implementor.getTypeFactory(), getRowType(), pref.prefer(inputResult.format)); return implementor.result(physType, builder.toBlock()); } @Override protected Spool copy(RelTraitSet traitSet, RelNode input, Type readType, Type writeType) { return new EnumerableTableSpool(input.getCluster(), traitSet, input, readType, writeType, table); } }





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