/**
* 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.hadoop.hive.ql.hooks;
import java.io.Serializable;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.apache.hadoop.hive.metastore.api.FieldSchema;
import org.apache.hadoop.hive.metastore.api.Partition;
import org.apache.hadoop.hive.metastore.api.Table;
/**
* This class contains the lineage information that is passed
* to the PreExecution hook.
*/
public class LineageInfo implements Serializable {
/**
* Serial version id.
*/
private static final long serialVersionUID = 1L;
/**
* Enum to track dependency. This enum has the following values:
* 1. SIMPLE - Indicates that the column is derived from another table column
* with no transformations e.g. T2.c1 = T1.c1.
* 2. EXPRESSION - Indicates that the column is derived from a UDF, UDAF, UDTF or
* set operations like union on columns on other tables
* e.g. T2.c1 = T1.c1 + T3.c1.
* 4. SCRIPT - Indicates that the column is derived from the output
* of a user script through a TRANSFORM, MAP or REDUCE syntax.
*/
public static enum DependencyType {
SIMPLE, EXPRESSION, SCRIPT
}
/**
* Table or Partition data container. We need this class because the output
* of the query can either go to a table or a partition within a table. The
* data container class subsumes both of these.
*/
public static class DataContainer implements Serializable {
/**
* Serial version id.
*/
private static final long serialVersionUID = 1L;
/**
* The table in case this container is a table.
*/
private final Table tab;
/**
* The partition in case this container is a partition.
*/
private final Partition part;
/**
* Constructor for non partitioned tables.
*
* @param tab The associated table.
*/
public DataContainer(Table tab) {
this.tab = tab;
this.part = null;
}
/**
* Constructor for a partitioned tables partition.
*
* @param part The associated partition.
*/
public DataContainer(Table tab, Partition part) {
this.tab = tab;
this.part = part;
}
/**
* Returns true in case this data container is a partition.
*
* @return boolean TRUE if the container is a table partition.
*/
public boolean isPartition() {
return (part != null);
}
public Table getTable() {
return this.tab;
}
public Partition getPartition() {
return this.part;
}
}
/**
* Class that captures the lookup key for the dependency. The dependency
* is from (DataContainer, FieldSchema) to a Dependency structure. This
* class captures the (DataContainer, FieldSchema) tuple.
*/
public static class DependencyKey implements Serializable {
/**
* Serial version id.
*/
private static final long serialVersionUID = 1L;
/**
* The data container for this key.
*/
private final DataContainer dc;
/**
* The field schema for this key.
*/
private final FieldSchema fld;
/**
* Constructor.
*
* @param dc The associated data container.
* @param fld The associated field schema.
*/
public DependencyKey(DataContainer dc, FieldSchema fld) {
this.dc = dc;
this.fld = fld;
}
public DataContainer getDataContainer() {
return this.dc;
}
public FieldSchema getFieldSchema() {
return this.fld;
}
/* (non-Javadoc)
* @see java.lang.Object#hashCode()
*/
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((dc == null) ? 0 : dc.hashCode());
result = prime * result + ((fld == null) ? 0 : fld.hashCode());
return result;
}
/* (non-Javadoc)
* @see java.lang.Object#equals(java.lang.Object)
*/
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
DependencyKey other = (DependencyKey) obj;
if (dc != other.dc) {
return false;
}
if (fld != other.fld) {
return false;
}
return true;
}
}
/**
* Base Column information.
*/
public static class BaseColumnInfo implements Serializable {
/**
* Serial version id.
*/
private static final long serialVersionUID = 1L;
/**
* The table and alias info encapsulated in a different class.
*/
private TableAliasInfo tabAlias;
/**
* The metastore column information. The column can be null
* and that denotes that the expression is dependent on the row
* of the table and not particular column. This can happen in case
* of count(1).
*/
private FieldSchema column;
/**
* @return the tabAlias
*/
public TableAliasInfo getTabAlias() {
return tabAlias;
}
/**
* @param tabAlias the tabAlias to set
*/
public void setTabAlias(TableAliasInfo tabAlias) {
this.tabAlias = tabAlias;
}
/**
* @return the column
*/
public FieldSchema getColumn() {
return column;
}
/**
* @param column the column to set
*/
public void setColumn(FieldSchema column) {
this.column = column;
}
}
public static class TableAliasInfo implements Serializable {
/**
* Serail version id.
*/
private static final long serialVersionUID = 1L;
/**
* The alias for the table.
*/
private String alias;
/**
* The metastore table information.
*/
private Table table;
/**
* @return the alias
*/
public String getAlias() {
return alias;
}
/**
* @param alias the alias to set
*/
public void setAlias(String alias) {
this.alias = alias;
}
/**
* @return the table
*/
public Table getTable() {
return table;
}
/**
* @param table the table to set
*/
public void setTable(Table table) {
this.table = table;
}
}
/**
* This class tracks the dependency information for the base column.
*/
public static class Dependency implements Serializable {
/**
*
*/
private static final long serialVersionUID = 1L;
/**
* The type of dependency.
*/
private DependencyType type;
/**
* Expression string for the dependency.
*/
private String expr;
/**
* The list of base columns that the particular column depends on.
*/
private List<BaseColumnInfo> baseCols;
/**
* @return the type
*/
public DependencyType getType() {
return type;
}
/**
* @param type the type to set
*/
public void setType(DependencyType type) {
this.type = type;
}
/**
* @return the expr
*/
public String getExpr() {
return expr;
}
/**
* @param expr the expr to set
*/
public void setExpr(String expr) {
this.expr = expr;
}
/**
* @return the baseCols
*/
public List<BaseColumnInfo> getBaseCols() {
return baseCols;
}
/**
* @param baseCols the baseCols to set
*/
public void setBaseCols(List<BaseColumnInfo> baseCols) {
this.baseCols = baseCols;
}
}
/**
* The map contains an index from the (datacontainer, columnname) to the
* dependency vector for that tuple. This is used to generate the
* dependency vectors during the walk of the operator tree.
*/
protected Map<DependencyKey, Dependency> index;
/**
* Constructor.
*/
public LineageInfo() {
index = new LinkedHashMap<DependencyKey, Dependency>();
}
/**
* Gets the dependency for a table, column tuple.
* @param dc The data container of the column whose dependency is being inspected.
* @param col The column whose dependency is being inspected.
* @return Dependency for that particular table, column tuple.
* null if no dependency is found.
*/
public Dependency getDependency(DataContainer dc, FieldSchema col) {
return index.get(new DependencyKey(dc, col));
}
/**
* Puts the dependency for a table, column tuple.
* @param dc The datacontainer whose dependency is being inserted.
* @param col The column whose dependency is being inserted.
* @param dep The dependency.
*/
public void putDependency(DataContainer dc, FieldSchema col, Dependency dep) {
index.put(new DependencyKey(dc, col), dep);
}
/**
* Gets the entry set on this structure.
*
* @return LineageInfo entry set
*/
public Set<Map.Entry<DependencyKey, Dependency>> entrySet() {
return index.entrySet();
}
}