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From paul-rogers <...@git.apache.org>
Subject [GitHub] drill pull request #795: DRILL-5089: Get only partial schemas of relevant st...
Date Sun, 26 Mar 2017 05:46:24 GMT
Github user paul-rogers commented on a diff in the pull request:

    --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/planner/sql/DrillCatalogReader.java
    @@ -0,0 +1,180 @@
    + * 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
    + * <p>
    + * http://www.apache.org/licenses/LICENSE-2.0
    + * <p>
    + * 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.drill.exec.planner.sql;
    +import com.google.common.base.Joiner;
    +import com.google.common.collect.ImmutableList;
    +import com.google.common.collect.Lists;
    +import com.google.common.collect.Sets;
    +import org.apache.calcite.adapter.java.JavaTypeFactory;
    +import org.apache.calcite.jdbc.CalciteSchema;
    +import org.apache.calcite.jdbc.CalciteSchemaImpl;
    +import org.apache.calcite.jdbc.SimpleCalciteSchema;
    +import org.apache.calcite.prepare.CalciteCatalogReader;
    +import org.apache.calcite.prepare.RelOptTableImpl;
    +import org.apache.calcite.schema.SchemaPlus;
    +import org.apache.drill.common.config.DrillConfig;
    +import org.apache.drill.common.exceptions.UserException;
    +import org.apache.drill.exec.ops.QueryContext;
    +import org.apache.drill.exec.store.SchemaConfig;
    +import java.util.Arrays;
    +import java.util.List;
    +import java.util.Set;
    + * Implementation of {@link org.apache.calcite.prepare.Prepare.CatalogReader}
    --- End diff --
    Maybe explain the purpose and not just the implementation? What part of query processing
does this address? Does this resolve references to schemas and workspaces? Then the schema
resolves the reference to a table name?

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