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The plugin that powers ESQL for Elasticsearch
/*
* Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
* or more contributor license agreements. Licensed under the Elastic License
* 2.0; you may not use this file except in compliance with the Elastic License
* 2.0.
*/
package org.elasticsearch.xpack.esql.io.stream;
import org.elasticsearch.common.breaker.CircuitBreaker;
import org.elasticsearch.common.breaker.NoopCircuitBreaker;
import org.elasticsearch.common.io.stream.NamedWriteableAwareStreamInput;
import org.elasticsearch.common.io.stream.NamedWriteableRegistry;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.util.BigArrays;
import org.elasticsearch.compute.data.Block;
import org.elasticsearch.compute.data.BlockFactory;
import org.elasticsearch.compute.data.BlockStreamInput;
import org.elasticsearch.compute.data.BlockUtils;
import org.elasticsearch.compute.data.BooleanBigArrayBlock;
import org.elasticsearch.compute.data.DoubleBigArrayBlock;
import org.elasticsearch.compute.data.IntBigArrayBlock;
import org.elasticsearch.compute.data.LongBigArrayBlock;
import org.elasticsearch.core.Releasables;
import org.elasticsearch.xpack.esql.Column;
import org.elasticsearch.xpack.esql.core.expression.NameId;
import org.elasticsearch.xpack.esql.core.plan.logical.LogicalPlan;
import org.elasticsearch.xpack.esql.io.stream.PlanNameRegistry.PlanNamedReader;
import org.elasticsearch.xpack.esql.io.stream.PlanNameRegistry.PlanReader;
import org.elasticsearch.xpack.esql.plan.physical.PhysicalPlan;
import org.elasticsearch.xpack.esql.session.EsqlConfiguration;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.function.LongFunction;
/**
* A customized stream input used to deserialize ESQL physical plan fragments. Complements stream
* input with methods that read plan nodes, Attributes, Expressions, etc.
*/
public final class PlanStreamInput extends NamedWriteableAwareStreamInput
implements
org.elasticsearch.xpack.esql.core.util.PlanStreamInput {
/**
* A Mapper of stream named id, represented as a primitive long value, to NameId instance.
* The no-args NameId constructor is used for absent entries, as it will automatically select
* and increment an id from the global counter, thus avoiding potential conflicts between the
* id in the stream and id's during local re-planning on the data node.
*/
static final class NameIdMapper implements LongFunction {
final Map seen = new HashMap<>();
@Override
public NameId apply(long streamNameId) {
return seen.computeIfAbsent(streamNameId, k -> new NameId());
}
}
private final Map cachedBlocks = new HashMap<>();
private final PlanNameRegistry registry;
// hook for nameId, where can cache and map, for now just return a NameId of the same long value.
private final LongFunction nameIdFunction;
private final EsqlConfiguration configuration;
public PlanStreamInput(
StreamInput streamInput,
PlanNameRegistry registry,
NamedWriteableRegistry namedWriteableRegistry,
EsqlConfiguration configuration
) {
super(streamInput, namedWriteableRegistry);
this.registry = registry;
this.configuration = configuration;
this.nameIdFunction = new NameIdMapper();
}
public LogicalPlan readLogicalPlanNode() throws IOException {
return readNamed(LogicalPlan.class);
}
public PhysicalPlan readPhysicalPlanNode() throws IOException {
return readNamed(PhysicalPlan.class);
}
public PhysicalPlan readOptionalPhysicalPlanNode() throws IOException {
return readOptionalNamed(PhysicalPlan.class);
}
public T readNamed(Class type) throws IOException {
String name = readString();
@SuppressWarnings("unchecked")
PlanReader reader = (PlanReader) registry.getReader(type, name);
if (reader instanceof PlanNamedReader namedReader) {
return namedReader.read(this, name);
} else {
return reader.read(this);
}
}
public T readOptionalNamed(Class type) throws IOException {
if (readBoolean()) {
T t = readNamed(type);
if (t == null) {
throwOnNullOptionalRead(type);
}
return t;
} else {
return null;
}
}
public EsqlConfiguration configuration() throws IOException {
return configuration;
}
/**
* Read a {@link Block} as part of the plan.
*
* These {@link Block}s are not tracked by {@link BlockFactory} and closing them
* does nothing so they should be small. We do make sure not to send duplicates,
* reusing blocks sent as part of the {@link EsqlConfiguration#tables()} if
* possible, otherwise sending a {@linkplain Block} inline.
*
*/
public Block readCachedBlock() throws IOException {
byte key = readByte();
Block block = switch (key) {
case PlanStreamOutput.NEW_BLOCK_KEY -> {
int id = readVInt();
// TODO track blocks read over the wire.... Or slice them from BigArrays? Something.
Block b = new BlockStreamInput(
this,
new BlockFactory(new NoopCircuitBreaker(CircuitBreaker.REQUEST), BigArrays.NON_RECYCLING_INSTANCE)
).readNamedWriteable(Block.class);
cachedBlocks.put(id, b);
yield b;
}
case PlanStreamOutput.FROM_PREVIOUS_KEY -> cachedBlocks.get(readVInt());
case PlanStreamOutput.FROM_CONFIG_KEY -> {
String tableName = readString();
Map table = configuration.tables().get(tableName);
if (table == null) {
throw new IOException("can't find table [" + tableName + "]");
}
String columnName = readString();
Column column = table.get(columnName);
if (column == null) {
throw new IOException("can't find column[" + columnName + "]");
}
yield column.values();
}
default -> throw new IOException("invalid encoding for Block");
};
assert block instanceof LongBigArrayBlock == false : "BigArrays not supported because we don't close";
assert block instanceof IntBigArrayBlock == false : "BigArrays not supported because we don't close";
assert block instanceof DoubleBigArrayBlock == false : "BigArrays not supported because we don't close";
assert block instanceof BooleanBigArrayBlock == false : "BigArrays not supported because we don't close";
return block;
}
/**
* Read an array of {@link Block}s as part of the plan.
*
* These {@link Block}s are not tracked by {@link BlockFactory} and closing them
* does nothing so they should be small. We do make sure not to send duplicates,
* reusing blocks sent as part of the {@link EsqlConfiguration#tables()} if
* possible, otherwise sending a {@linkplain Block} inline.
*
*/
public Block[] readCachedBlockArray() throws IOException {
int len = readArraySize();
if (len == 0) {
return BlockUtils.NO_BLOCKS;
}
Block[] blocks = new Block[len];
try {
for (int i = 0; i < blocks.length; i++) {
blocks[i] = readCachedBlock();
}
return blocks;
} finally {
if (blocks[blocks.length - 1] == null) {
// Wasn't successful reading all blocks
Releasables.closeExpectNoException(blocks);
}
}
}
@Override
public String sourceText() {
return configuration.query();
}
static void throwOnNullOptionalRead(Class type) throws IOException {
final IOException e = new IOException("read optional named returned null which is not allowed, type:" + type);
assert false : e;
throw e;
}
@Override
public NameId mapNameId(long l) {
return nameIdFunction.apply(l);
}
}
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