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This module contains logical plan and query optimization parts.
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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 org.apache.tajo.plan.rewrite;
import com.google.common.base.Objects;
import org.apache.tajo.SessionVars;
import org.apache.tajo.algebra.*;
import org.apache.tajo.catalog.*;
import org.apache.tajo.common.TajoDataTypes.Type;
import org.apache.tajo.exception.TajoException;
import org.apache.tajo.exception.TajoInternalError;
import org.apache.tajo.exception.UnsupportedException;
import org.apache.tajo.plan.ExprAnnotator;
import org.apache.tajo.plan.LogicalPlan;
import org.apache.tajo.plan.LogicalPlan.QueryBlock;
import org.apache.tajo.plan.LogicalPlanner.PlanContext;
import org.apache.tajo.plan.algebra.BaseAlgebraVisitor;
import org.apache.tajo.plan.logical.*;
import org.apache.tajo.plan.nameresolver.NameResolver;
import org.apache.tajo.plan.nameresolver.NameResolvingMode;
import org.apache.tajo.plan.rewrite.BaseSchemaBuildPhase.Processor.NameRefInSelectListNormalizer;
import org.apache.tajo.plan.util.ExprFinder;
import org.apache.tajo.plan.util.PlannerUtil;
import org.apache.tajo.plan.visitor.SimpleAlgebraVisitor;
import org.apache.tajo.util.StringUtils;
import org.apache.tajo.util.TUtil;
import org.apache.tajo.util.graph.DirectedGraphVisitor;
import org.apache.tajo.util.graph.SimpleDirectedGraph;
import java.util.*;
/**
* SelfDescSchemaBuildPhase builds the schema information of tables of self-describing data formats,
* such as JSON, Parquet, and ORC.
*/
public class SelfDescSchemaBuildPhase extends LogicalPlanPreprocessPhase {
private Processor processor;
public SelfDescSchemaBuildPhase(CatalogService catalog, ExprAnnotator annotator) {
super(catalog, annotator);
}
@Override
public String getName() {
return "Self-describing schema build phase";
}
private static String getQualifiedName(PlanContext context, String simpleName) {
return CatalogUtil.isFQTableName(simpleName) ?
simpleName :
CatalogUtil.buildFQName(context.getQueryContext().get(SessionVars.CURRENT_DATABASE), simpleName);
}
@Override
public boolean isEligible(PlanContext context, Expr expr) throws TajoException {
Set relations = ExprFinderIncludeSubquery.finds(expr, OpType.Relation);
for (Relation eachRelation : relations) {
TableDesc tableDesc = catalog.getTableDesc(getQualifiedName(context, eachRelation.getName()));
if (tableDesc.hasEmptySchema()) {
return true;
}
}
return false;
}
static class FinderContext {
Set set = new HashSet<>();
OpType targetType;
FinderContext(OpType type) {
this.targetType = type;
}
}
private static class ExprFinderIncludeSubquery extends SimpleAlgebraVisitor {
public static Set finds(Expr expr, OpType type) throws TajoException {
FinderContext context = new FinderContext<>(type);
ExprFinderIncludeSubquery finder = new ExprFinderIncludeSubquery();
finder.visit(context, new Stack(), expr);
return context.set;
}
@Override
public Object visit(FinderContext ctx, Stack stack, Expr expr) throws TajoException {
if (expr instanceof Selection) {
preHook(ctx, stack, expr);
visit(ctx, stack, ((Selection) expr).getQual());
visitUnaryOperator(ctx, stack, (UnaryOperator) expr);
postHook(ctx, stack, expr, null);
} else if (expr instanceof UnaryOperator) {
preHook(ctx, stack, expr);
visitUnaryOperator(ctx, stack, (UnaryOperator) expr);
postHook(ctx, stack, expr, null);
} else if (expr instanceof BinaryOperator) {
preHook(ctx, stack, expr);
visitBinaryOperator(ctx, stack, (BinaryOperator) expr);
postHook(ctx, stack, expr, null);
} else if (expr instanceof SimpleTableSubquery) {
preHook(ctx, stack, expr);
visit(ctx, stack, ((SimpleTableSubquery) expr).getSubQuery());
postHook(ctx, stack, expr, null);
} else if (expr instanceof TablePrimarySubQuery) {
preHook(ctx, stack, expr);
visit(ctx, stack, ((TablePrimarySubQuery) expr).getSubQuery());
postHook(ctx, stack, expr, null);
} else {
super.visit(ctx, stack, expr);
}
if (expr != null && ctx.targetType == expr.getType()) {
ctx.set.add(expr);
}
return null;
}
}
@Override
public LogicalNode process(PlanContext context, Expr expr) throws TajoException {
if (processor == null) {
processor = new Processor();
}
return processor.visit(new ProcessorContext(context), new Stack(), expr);
}
static class ProcessorContext {
final PlanContext planContext;
final Map> projectColumns = new HashMap<>();
final Set aliasSet = new HashSet<>();
public ProcessorContext(PlanContext planContext) {
this.planContext = planContext;
}
}
static class Processor extends BaseAlgebraVisitor {
private static T getNodeFromExpr(LogicalPlan plan, Expr expr) {
return plan.getBlockByExpr(expr).getNodeFromExpr(expr);
}
private static T getNonRelationListExpr(LogicalPlan plan, Expr expr) {
if (expr instanceof RelationList) {
return getNodeFromExpr(plan, ((RelationList) expr).getRelations()[0]);
} else {
return getNodeFromExpr(plan, expr);
}
}
@Override
public LogicalNode visitProjection(ProcessorContext ctx, Stack stack, Projection expr) throws TajoException {
if (PlannerUtil.hasAsterisk(expr.getNamedExprs())) {
throw new UnsupportedException("Asterisk for self-describing data formats");
}
for (NamedExpr eachNamedExpr : expr.getNamedExprs()) {
Set columns = ExprFinder.finds(eachNamedExpr, OpType.Column);
for (ColumnReferenceExpr col : columns) {
TUtil.putToNestedList(ctx.projectColumns, col.getQualifier(), col);
}
if (eachNamedExpr.hasAlias()) {
ctx.aliasSet.add(eachNamedExpr.getAlias());
}
}
super.visitProjection(ctx, stack, expr);
ProjectionNode node = getNodeFromExpr(ctx.planContext.getPlan(), expr);
LogicalNode child = getNonRelationListExpr(ctx.planContext.getPlan(), expr.getChild());
node.setInSchema(child.getOutSchema());
return node;
}
@Override
public LogicalNode visitLimit(ProcessorContext ctx, Stack stack, Limit expr) throws TajoException {
super.visitLimit(ctx, stack, expr);
LimitNode node = getNodeFromExpr(ctx.planContext.getPlan(), expr);
LogicalNode child = getNonRelationListExpr(ctx.planContext.getPlan(), expr.getChild());
node.setInSchema(child.getOutSchema());
node.setOutSchema(node.getInSchema());
return node;
}
@Override
public LogicalNode visitSort(ProcessorContext ctx, Stack stack, Sort expr) throws TajoException {
super.visitSort(ctx, stack, expr);
SortNode node = getNodeFromExpr(ctx.planContext.getPlan(), expr);
LogicalNode child = getNonRelationListExpr(ctx.planContext.getPlan(), expr.getChild());
node.setInSchema(child.getOutSchema());
node.setOutSchema(node.getInSchema());
return node;
}
@Override
public LogicalNode visitHaving(ProcessorContext ctx, Stack stack, Having expr) throws TajoException {
super.visitHaving(ctx, stack, expr);
HavingNode node = getNodeFromExpr(ctx.planContext.getPlan(), expr);
LogicalNode child = getNonRelationListExpr(ctx.planContext.getPlan(), expr.getChild());
node.setInSchema(child.getOutSchema());
node.setOutSchema(node.getInSchema());
return node;
}
@Override
public LogicalNode visitGroupBy(ProcessorContext ctx, Stack stack, Aggregation expr) throws TajoException {
super.visitGroupBy(ctx, stack, expr);
GroupbyNode node = getNodeFromExpr(ctx.planContext.getPlan(), expr);
LogicalNode child = getNonRelationListExpr(ctx.planContext.getPlan(), expr.getChild());
node.setInSchema(child.getOutSchema());
return node;
}
@Override
public LogicalNode visitJoin(ProcessorContext ctx, Stack stack, Join expr) throws TajoException {
super.visitJoin(ctx, stack, expr);
JoinNode node = getNodeFromExpr(ctx.planContext.getPlan(), expr);
LogicalNode leftChild = getNonRelationListExpr(ctx.planContext.getPlan(), expr.getLeft());
LogicalNode rightChild = getNonRelationListExpr(ctx.planContext.getPlan(), expr.getRight());
node.setInSchema(SchemaUtil.merge(leftChild.getOutSchema(), rightChild.getOutSchema()));
node.setOutSchema(node.getInSchema());
return node;
}
@Override
public LogicalNode visitFilter(ProcessorContext ctx, Stack stack, Selection expr) throws TajoException {
Set columnSet = ExprFinder.finds(expr.getQual(), OpType.Column);
for (ColumnReferenceExpr col : columnSet) {
if (!ctx.aliasSet.contains(col.getName())) {
NameRefInSelectListNormalizer.normalize(ctx.planContext, col);
TUtil.putToNestedList(ctx.projectColumns, col.getQualifier(), col);
}
}
super.visitFilter(ctx, stack, expr);
SelectionNode node = getNodeFromExpr(ctx.planContext.getPlan(), expr);
LogicalNode child = getNonRelationListExpr(ctx.planContext.getPlan(), expr.getChild());
node.setInSchema(child.getOutSchema());
node.setOutSchema(node.getInSchema());
return node;
}
@Override
public LogicalNode visitUnion(ProcessorContext ctx, Stack stack, SetOperation expr) throws TajoException {
super.visitUnion(ctx, stack, expr);
UnionNode node = getNodeFromExpr(ctx.planContext.getPlan(), expr);
LogicalNode child = getNonRelationListExpr(ctx.planContext.getPlan(), expr.getLeft());
node.setInSchema(child.getOutSchema());
node.setOutSchema(node.getInSchema());
return node;
}
@Override
public LogicalNode visitExcept(ProcessorContext ctx, Stack stack, SetOperation expr) throws TajoException {
super.visitExcept(ctx, stack, expr);
ExceptNode node = getNodeFromExpr(ctx.planContext.getPlan(), expr);
LogicalNode child = getNonRelationListExpr(ctx.planContext.getPlan(), expr.getLeft());
node.setInSchema(child.getOutSchema());
node.setOutSchema(node.getInSchema());
return node;
}
@Override
public LogicalNode visitIntersect(ProcessorContext ctx, Stack stack, SetOperation expr) throws TajoException {
super.visitIntersect(ctx, stack, expr);
IntersectNode node = getNodeFromExpr(ctx.planContext.getPlan(), expr);
LogicalNode child = getNonRelationListExpr(ctx.planContext.getPlan(), expr.getLeft());
node.setInSchema(child.getOutSchema());
node.setOutSchema(node.getInSchema());
return node;
}
@Override
public LogicalNode visitSimpleTableSubquery(ProcessorContext ctx, Stack stack, SimpleTableSubquery expr)
throws TajoException {
QueryBlock childBlock = ctx.planContext.getPlan().getBlock(
ctx.planContext.getPlan().getBlockNameByExpr(expr.getSubQuery()));
ProcessorContext newContext = new ProcessorContext(new PlanContext(ctx.planContext, childBlock));
super.visitSimpleTableSubquery(newContext, stack, expr);
TableSubQueryNode node = getNodeFromExpr(ctx.planContext.getPlan(), expr);
LogicalNode child = getNonRelationListExpr(ctx.planContext.getPlan(), expr.getSubQuery());
node.setInSchema(child.getOutSchema());
node.setOutSchema(node.getInSchema());
return node;
}
@Override
public LogicalNode visitTableSubQuery(ProcessorContext ctx, Stack stack, TablePrimarySubQuery expr)
throws TajoException {
QueryBlock childBlock = ctx.planContext.getPlan().getBlock(
ctx.planContext.getPlan().getBlockNameByExpr(expr.getSubQuery()));
ProcessorContext newContext = new ProcessorContext(new PlanContext(ctx.planContext, childBlock));
super.visitTableSubQuery(newContext, stack, expr);
TableSubQueryNode node = getNodeFromExpr(ctx.planContext.getPlan(), expr);
LogicalNode child = getNonRelationListExpr(ctx.planContext.getPlan(), expr.getSubQuery());
node.setInSchema(child.getOutSchema());
node.setOutSchema(node.getInSchema());
return node;
}
@Override
public LogicalNode visitCreateTable(ProcessorContext ctx, Stack stack, CreateTable expr) throws TajoException {
super.visitCreateTable(ctx, stack, expr);
CreateTableNode node = getNodeFromExpr(ctx.planContext.getPlan(), expr);
if (expr.hasSubQuery()) {
LogicalNode child = getNonRelationListExpr(ctx.planContext.getPlan(), expr.getSubQuery());
node.setInSchema(child.getOutSchema());
node.setOutSchema(node.getInSchema());
}
return node;
}
@Override
public LogicalNode visitInsert(ProcessorContext ctx, Stack stack, Insert expr) throws TajoException {
super.visitInsert(ctx, stack, expr);
InsertNode node = getNodeFromExpr(ctx.planContext.getPlan(), expr);
LogicalNode child = getNonRelationListExpr(ctx.planContext.getPlan(), expr.getSubQuery());
node.setInSchema(child.getOutSchema());
node.setOutSchema(node.getInSchema());
return node;
}
@Override
public LogicalNode visitRelation(ProcessorContext ctx, Stack stack, Relation expr) throws TajoException {
LogicalPlan plan = ctx.planContext.getPlan();
QueryBlock queryBlock = plan.getBlockByExpr(expr);
ScanNode scan = queryBlock.getNodeFromExpr(expr);
TableDesc desc = scan.getTableDesc();
if (desc.hasEmptySchema()) {
Set columns = new HashSet<>();
if (ctx.projectColumns.containsKey(getQualifiedName(ctx.planContext, expr.getName()))) {
for (ColumnReferenceExpr col : ctx.projectColumns.get(getQualifiedName(ctx.planContext, expr.getName()))) {
columns.add(NameResolver.resolve(plan, queryBlock, col, NameResolvingMode.RELS_ONLY, true));
}
}
if (expr.hasAlias()) {
if (ctx.projectColumns.containsKey(getQualifiedName(ctx.planContext, expr.getAlias()))) {
for (ColumnReferenceExpr col : ctx.projectColumns.get(getQualifiedName(ctx.planContext, expr.getAlias()))) {
columns.add(NameResolver.resolve(plan, queryBlock, col, NameResolvingMode.RELS_ONLY, true));
}
}
}
if (columns.isEmpty()) {
// error
throw new TajoInternalError(
"Columns projected from " + getQualifiedName(ctx.planContext, expr.getName()) + " is not found.");
}
desc.setSchema(buildSchemaFromColumnSet(columns));
scan.init(desc);
}
return scan;
}
/**
* This method creates a schema from a set of columns.
* For a nested column, its ancestors are guessed and added to the schema.
* For example, given a column 'glossary.title', the columns of (glossary RECORD (title TEXT)) will be added
* to the schema.
*
* @param columns a set of columns
* @return schema build from columns
*/
private Schema buildSchemaFromColumnSet(Set columns) throws TajoException {
SchemaGraph schemaGraph = new SchemaGraph();
Set rootVertexes = new HashSet<>();
Schema schema = new Schema();
Set simpleColumns = new HashSet<>();
List columnList = new ArrayList<>(columns);
Collections.sort(columnList, new Comparator() {
@Override
public int compare(Column c1, Column c2) {
return c2.getSimpleName().split(NestedPathUtil.PATH_DELIMITER).length -
c1.getSimpleName().split(NestedPathUtil.PATH_DELIMITER).length;
}
});
for (Column eachColumn : columnList) {
String simpleName = eachColumn.getSimpleName();
if (NestedPathUtil.isPath(simpleName)) {
String[] paths = simpleName.split(NestedPathUtil.PATH_DELIMITER);
for (int i = 0; i < paths.length-1; i++) {
String parentName = paths[i];
if (i == 0) {
parentName = CatalogUtil.buildFQName(eachColumn.getQualifier(), parentName);
}
// Leaf column type is TEXT; otherwise, RECORD.
ColumnVertex childVertex = new ColumnVertex(
paths[i+1],
StringUtils.join(paths, NestedPathUtil.PATH_DELIMITER, 0, i+2),
Type.RECORD
);
if (i == paths.length - 2 && !schemaGraph.hasVertex(childVertex)) {
childVertex = new ColumnVertex(childVertex.name, childVertex.path, Type.TEXT);
}
ColumnVertex parentVertex = new ColumnVertex(
parentName,
StringUtils.join(paths, NestedPathUtil.PATH_DELIMITER, 0, i+1),
Type.RECORD);
schemaGraph.addEdge(new ColumnEdge(childVertex, parentVertex));
if (i == 0) {
rootVertexes.add(parentVertex);
}
}
} else {
simpleColumns.add(eachColumn);
}
}
// Build record columns
RecordColumnBuilder builder = new RecordColumnBuilder(schemaGraph);
for (ColumnVertex eachRoot : rootVertexes) {
schemaGraph.accept(eachRoot, builder);
schema.addColumn(eachRoot.column);
}
// Add simple columns
for (Column eachColumn : simpleColumns) {
if (!schema.contains(eachColumn)) {
schema.addColumn(eachColumn);
}
}
return schema;
}
private static class ColumnVertex {
private final String path;
private final String name;
private final Type type;
private Column column;
public ColumnVertex(String name, String path, Type type) {
this.name = name;
this.path = path;
this.type = type;
}
@Override
public boolean equals(Object o) {
if (o instanceof ColumnVertex) {
ColumnVertex other = (ColumnVertex) o;
return this.name.equals(other.name) &&
this.path.equals(other.path);
}
return false;
}
@Override
public int hashCode() {
return Objects.hashCode(name, path);
}
}
private static class ColumnEdge {
private final ColumnVertex parent;
private final ColumnVertex child;
public ColumnEdge(ColumnVertex child, ColumnVertex parent) {
this.child = child;
this.parent = parent;
}
}
private static class SchemaGraph extends SimpleDirectedGraph {
public void addEdge(ColumnEdge edge) {
this.addEdge(edge.child, edge.parent, edge);
}
public boolean hasVertex(ColumnVertex vertex) {
return this.directedEdges.containsKey(vertex) || this.reversedEdges.containsKey(vertex);
}
}
private static class RecordColumnBuilder implements DirectedGraphVisitor {
private final SchemaGraph graph;
public RecordColumnBuilder(SchemaGraph graph) {
this.graph = graph;
}
@Override
public void visit(Stack stack, ColumnVertex schemaVertex) {
if (graph.isLeaf(schemaVertex)) {
schemaVertex.column = new Column(schemaVertex.name, schemaVertex.type);
} else {
Schema schema = new Schema();
for (ColumnVertex eachChild : graph.getChilds(schemaVertex)) {
schema.addColumn(eachChild.column);
}
schemaVertex.column = new Column(schemaVertex.name, new TypeDesc(schema));
}
}
}
}
}
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