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From GitBox <...@apache.org>
Subject [GitHub] [flink] wuchong commented on a change in pull request #10224: [FLINK-14716][table-planner-blink] Cooperate computed column with push down rules
Date Mon, 18 Nov 2019 08:31:10 GMT
wuchong commented on a change in pull request #10224: [FLINK-14716][table-planner-blink] Cooperate
computed column with push down rules
URL: https://github.com/apache/flink/pull/10224#discussion_r347230376
 
 

 ##########
 File path: flink-table/flink-table-planner-blink/src/main/java/org/apache/flink/table/planner/plan/schema/FlinkPreparingTableBase.java
 ##########
 @@ -0,0 +1,316 @@
+/*
+ * 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.table.planner.plan.schema;
+
+import org.apache.flink.annotation.Internal;
+import org.apache.flink.table.planner.plan.stats.FlinkStatistic;
+import org.apache.flink.table.sources.TableSource;
+
+import org.apache.flink.shaded.guava18.com.google.common.base.Strings;
+import org.apache.flink.shaded.guava18.com.google.common.collect.ImmutableList;
+import org.apache.flink.shaded.guava18.com.google.common.collect.ImmutableSet;
+
+import org.apache.calcite.linq4j.tree.Expression;
+import org.apache.calcite.plan.RelOptSchema;
+import org.apache.calcite.plan.RelOptTable;
+import org.apache.calcite.plan.RelOptTable.ToRelContext;
+import org.apache.calcite.prepare.Prepare;
+import org.apache.calcite.rel.RelCollation;
+import org.apache.calcite.rel.RelDistribution;
+import org.apache.calcite.rel.RelFieldCollation;
+import org.apache.calcite.rel.RelNode;
+import org.apache.calcite.rel.RelReferentialConstraint;
+import org.apache.calcite.rel.logical.LogicalTableScan;
+import org.apache.calcite.rel.type.RelDataType;
+import org.apache.calcite.schema.Table;
+import org.apache.calcite.sql.SqlAccessType;
+import org.apache.calcite.sql.validate.SqlModality;
+import org.apache.calcite.sql.validate.SqlMonotonicity;
+import org.apache.calcite.sql2rel.InitializerContext;
+import org.apache.calcite.util.ImmutableBitSet;
+import org.apache.calcite.util.Util;
+
+import javax.annotation.Nullable;
+
+import java.util.List;
+import java.util.Objects;
+import java.util.Set;
+import java.util.stream.Collectors;
+
+/** A Flink {@link org.apache.calcite.prepare.Prepare.AbstractPreparingTable} implementation
+ * for the purposes of the sql-to-rel conversion and planner.
+ */
+@Internal
+public abstract class FlinkPreparingTableBase extends Prepare.AbstractPreparingTable {
+	//~ Static fields/initializers ---------------------------------------------
+
+	// Default value of rowCount if there is no available stats.
+	// Sets a bigger default value to avoid broadcast join.
+	private static final double DEFAULT_ROWCOUNT = 1E8;
+
+	//~ Instance fields --------------------------------------------------------
+
+	@Nullable
+	protected final RelOptSchema relOptSchema;
+	protected final RelDataType rowType;
+	protected final List<String> names;
+
+	protected FlinkStatistic statistic;
+
+	//~ Constructors -----------------------------------------------------------
+
+	/**
+	 * Creates a {@link org.apache.calcite.prepare.Prepare.AbstractPreparingTable} instance.
+	 *
+	 * @param relOptSchema The RelOptSchema that this table comes from
+	 * @param rowType      The table row type
+	 * @param names        The table qualified name
+	 * @param statistic    The table statistics
+	 */
+	public FlinkPreparingTableBase(
+			@Nullable RelOptSchema relOptSchema,
+			RelDataType rowType,
+			Iterable<String> names,
+			FlinkStatistic statistic) {
+		this.relOptSchema = relOptSchema;
+		this.rowType = Objects.requireNonNull(rowType);
+		this.names = Objects.requireNonNull(ImmutableList.copyOf(names));
+		this.statistic = Objects.requireNonNull(statistic);
+	}
+
+	//~ Methods ----------------------------------------------------------------
+
+	/** Returns the statistic of this table. */
+	public FlinkStatistic getStatistic() {
+		return this.statistic;
+	}
+
+	/** Returns a copy of this table with a given {@link FlinkStatistic}. */
+	public abstract FlinkPreparingTableBase copy(FlinkStatistic statistic);
+
+	/**
+	 * Returns the table path in the {@link RelOptSchema}.
+	 * Different with {@link #getQualifiedName()}, the latter is mainly used for table digest.
+	 */
+	public List<String> getNames() {
+		return names;
+	}
+
+	@Override
+	public List<String> getQualifiedName() {
+		return names;
+	}
+
+	@Override
+	public RelNode toRel(ToRelContext context) {
+		return LogicalTableScan.create(context.getCluster(), this);
+	}
+
+	/**
+	 * Obtains whether a given column is monotonic.
+	 *
+	 * @param columnName Column name
+	 * @return True if the given column is monotonic
+	 */
+	public SqlMonotonicity getMonotonicity(String columnName) {
+		int columnIdx = getRowType().getFieldNames().indexOf(columnName);
+		if (columnIdx >= 0) {
+			for (RelCollation collation : getCollationList()) {
+				RelFieldCollation fieldCollation = collation.getFieldCollations().get(0);
+				if (fieldCollation.getFieldIndex() == columnIdx) {
+					return fieldCollation.direction.monotonicity();
+				}
+			}
+		}
+		return SqlMonotonicity.NOT_MONOTONIC;
+	}
+
+	/**
+	 * Obtains the access type of the table.
+	 *
+	 * @return all access types including SELECT/UPDATE/INSERT/DELETE
+	 */
+	public SqlAccessType getAllowedAccess() {
+		return SqlAccessType.ALL;
+	}
+
+	@Override
+	public boolean supportsModality(SqlModality modality) {
+		return false;
+	}
+
+	/**
+	 * We recognize all tables in FLink are temporal as they are changeable.
+	 */
+	public boolean isTemporal() {
+		return true;
+	}
+
+	/**
+	 * Returns an estimate of the number of rows in the table.
+	 */
+	public double getRowCount() {
+		Double rowCnt = getStatistic().getRowCount();
+		return rowCnt == null ? DEFAULT_ROWCOUNT : rowCnt;
+	}
+
+	/**
+	 * Returns the type of rows returned by this table.
+	 */
+	public RelDataType getRowType() {
+		return rowType;
+	}
+
+	@Override
+	public RelOptSchema getRelOptSchema() {
+		return relOptSchema;
+	}
+
+	/**
+	 * Returns a description of the physical ordering (or orderings) of the rows
+	 * returned from this table.
+	 *
+	 * @see org.apache.calcite.rel.metadata.RelMetadataQuery#collations(RelNode)
+	 */
+	public List<RelCollation> getCollationList() {
+		List<RelCollation> collations = this.statistic.getCollations();
+		return collations == null
+			? ImmutableList.of()
+			: collations;
+	}
+
+	/**
+	 * Returns a description of the physical distribution of the rows
+	 * in this table.
+	 *
+	 * @see org.apache.calcite.rel.metadata.RelMetadataQuery#distribution
+	 */
+	public RelDistribution getDistribution() {
+		return this.statistic.getDistribution();
+	}
+
+	/**
+	 * Returns whether the given columns are a key or a superset of a unique key
+	 * of this table.
+	 *
+	 * <p>Note: Return true means TRUE. However return false means FALSE or NOT KNOWN.
+	 * It's better to use
+	 * {@link org.apache.calcite.rel.metadata.RelMetadataQuery#areRowsUnique}
+	 * to distinguish FALSE with NOT KNOWN.
+	 *
+	 * @param columns Ordinals of key columns
+	 * @return If the input columns bits represents a unique column set;
+	 * false if not (or if no metadata is available)
+	 */
+	public boolean isKey(ImmutableBitSet columns) {
+		return false;
+	}
+
+	/**
+	 * Returns the referential constraints existing for this table. These constraints
+	 * are represented over other tables using {@link RelReferentialConstraint} nodes.
+	 */
+	public List<RelReferentialConstraint> getReferentialConstraints() {
+		List<RelReferentialConstraint> relReferentialConstraints = this.statistic.getReferentialConstraints();
+		return relReferentialConstraints == null
+			? ImmutableList.of()
+			: ImmutableList.of();
+	}
+
+	@Override
+	public <C> C unwrap(Class<C> clazz) {
+		if (clazz.isInstance(this)) {
+			return clazz.cast(this);
+		} else {
+			return null;
+		}
+	}
+
+	/**
+	 * Obtains whether the ordinal column has a default value, which is not supported now.
+	 *
+	 * @param rowType            Row type of field
+	 * @param ordinal            Index of the given column
+	 * @param initializerContext Context for
+	 *                           {@link org.apache.calcite.sql2rel.InitializerExpressionFactory}
+	 * @return true if the column has a default value
+	 */
+	public boolean columnHasDefaultValue(RelDataType rowType, int ordinal, InitializerContext
initializerContext) {
+		return false;
+	}
+
+	/**
+	 * Generates code for this table, which is not supported now.
+	 *
+	 * @param clazz The desired collection class,
+	 *              for example {@link org.apache.calcite.linq4j.Queryable}
+	 */
+	public Expression getExpression(Class clazz) {
+		throw new UnsupportedOperationException();
+	}
+
+	@Override
+	protected RelOptTable extend(Table extendedTable) {
+		throw new RuntimeException("Extending column not supported");
+	}
+
+	//~ Tools ------------------------------------------------------------------
+
+	/**
+	 * Returns the digest of the {@link TableSource} instance.
+	 */
+	protected List<String> explainSourceAsString(TableSource<?> ts) {
+		String tsDigest = ts.explainSource();
+		if (!Strings.isNullOrEmpty(tsDigest)) {
+			return ImmutableList.<String>builder()
+				.addAll(Util.skipLast(names))
+				.add(String.format("%s, source: [%s]", Util.last(names), tsDigest))
+				.build();
+		} else {
+			return names;
+		}
+	}
+
+	/**
+	 * Returns unique keySets of current table.
+	 */
+	public scala.Option<Set<ImmutableBitSet>> uniqueKeysSet() {
 
 Review comment:
   We should avoid using scala Option when converting implementation to Java.

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