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From fhueske <...@git.apache.org>
Subject [GitHub] flink pull request #2810: [FLINK-3848] Add ProjectableTableSource interface ...
Date Mon, 28 Nov 2016 14:12:10 GMT
Github user fhueske commented on a diff in the pull request:

    --- Diff: flink-libraries/flink-table/src/main/scala/org/apache/flink/api/table/plan/rules/dataSet/BatchProjectableTableSourceScanRule.scala
    @@ -0,0 +1,85 @@
    + * 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.flink.api.table.plan.rules.dataSet
    +import org.apache.calcite.plan.RelOptRule._
    +import org.apache.calcite.plan.{RelOptRule, RelOptRuleCall, RelTraitSet}
    +import org.apache.calcite.rel.core.TableScan
    +import org.apache.calcite.rel.logical.{LogicalProject, LogicalTableScan}
    +import org.apache.calcite.rex.RexInputRef
    +import org.apache.flink.api.table.plan.nodes.dataset.{BatchProjectableTableSourceScan,
    +import org.apache.flink.api.table.plan.schema.TableSourceTable
    +import org.apache.flink.api.table.sources.{BatchTableSource, ProjectableTableSource}
    +import scala.collection.JavaConverters._
    +/** Rule to convert a [[LogicalTableScan]] with [[LogicalProject]]
    +  * into a [[BatchProjectableTableSourceScan]].
    +  */
    +class BatchProjectableTableSourceScanRule
    +  extends RelOptRule(
    +    operand(classOf[LogicalProject], operand(classOf[TableScan], none())),
    --- End diff --
    Please check for `LogicalCalc` instead of `LogicalProject`.
    Calcite starts with `LogicalProject´ but merges those with other `LogicalProject` and
`LogicalFilter` into `LogicalCalc`. So after predicate and projection push-down, we might
only have a `LogicalCalc` and not a `LogicalProject` anymore.

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