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DRILL-2193: implement fast count / skip-all semantics for JSON reader
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38 changes: 38 additions & 0 deletions
38
exec/java-exec/src/main/java/org/apache/drill/exec/store/easy/json/JsonProcessor.java
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|---|---|---|
| @@ -0,0 +1,38 @@ | ||
| /** | ||
| * 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.drill.exec.store.easy.json; | ||
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| import java.io.IOException; | ||
| import java.io.InputStream; | ||
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| import org.apache.drill.exec.vector.complex.writer.BaseWriter; | ||
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| public interface JsonProcessor { | ||
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| public static enum ReadState { | ||
| WRITE_FAILURE, | ||
| END_OF_STREAM, | ||
| WRITE_SUCCEED | ||
| } | ||
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| ReadState write(BaseWriter.ComplexWriter writer) throws IOException; | ||
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| void setSource(InputStream is) throws IOException; | ||
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| void ensureAtLeastOneField(BaseWriter.ComplexWriter writer); | ||
| } |
58 changes: 58 additions & 0 deletions
58
...va-exec/src/main/java/org/apache/drill/exec/store/easy/json/reader/BaseJsonProcessor.java
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| Original file line number | Diff line number | Diff line change |
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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.drill.exec.store.easy.json.reader; | ||
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| import java.io.IOException; | ||
| import java.io.InputStream; | ||
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| import com.fasterxml.jackson.core.JsonFactory; | ||
| import com.fasterxml.jackson.core.JsonParser; | ||
| import com.fasterxml.jackson.core.io.IOContext; | ||
| import com.fasterxml.jackson.core.sym.BytesToNameCanonicalizer; | ||
| import com.fasterxml.jackson.core.util.BufferRecycler; | ||
| import com.google.common.base.Preconditions; | ||
| import io.netty.buffer.DrillBuf; | ||
| import org.apache.drill.exec.store.easy.json.JsonProcessor; | ||
| import org.apache.drill.exec.store.easy.json.RewindableUtf8Reader; | ||
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| public abstract class BaseJsonProcessor implements JsonProcessor { | ||
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| protected final RewindableUtf8Reader parser; | ||
| protected DrillBuf workBuf; | ||
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| public BaseJsonProcessor(DrillBuf workBuf) { | ||
| this.workBuf = Preconditions.checkNotNull(workBuf); | ||
| this.parser = Preconditions.checkNotNull(createParser()); | ||
| } | ||
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| protected RewindableUtf8Reader createParser() { | ||
| final BufferRecycler recycler = new BufferRecycler(); | ||
| final IOContext context = new IOContext(recycler, this, false); | ||
| final int features = JsonParser.Feature.collectDefaults() // | ||
| | JsonParser.Feature.ALLOW_COMMENTS.getMask() // | ||
| | JsonParser.Feature.ALLOW_UNQUOTED_FIELD_NAMES.getMask(); | ||
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| final BytesToNameCanonicalizer can = BytesToNameCanonicalizer.createRoot(); | ||
| return new RewindableUtf8Reader<>(context, features, can.makeChild(JsonFactory.Feature.collectDefaults()), context.allocReadIOBuffer()); | ||
| } | ||
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| @Override | ||
| public void setSource(InputStream is) throws IOException { | ||
| parser.setInputStream(is); | ||
| } | ||
| } |
50 changes: 50 additions & 0 deletions
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...a-exec/src/main/java/org/apache/drill/exec/store/easy/json/reader/CountingJsonReader.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,50 @@ | ||
| /** | ||
| * 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.drill.exec.store.easy.json.reader; | ||
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| import java.io.IOException; | ||
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| import com.fasterxml.jackson.core.JsonToken; | ||
| import io.netty.buffer.DrillBuf; | ||
| import org.apache.drill.exec.store.easy.json.JsonProcessor; | ||
| import org.apache.drill.exec.vector.complex.writer.BaseWriter; | ||
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| public class CountingJsonReader extends BaseJsonProcessor implements JsonProcessor { | ||
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| public CountingJsonReader(DrillBuf workBuf) { | ||
| super(workBuf); | ||
| } | ||
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| @Override | ||
| public ReadState write(BaseWriter.ComplexWriter writer) throws IOException { | ||
| final JsonToken token = parser.nextToken(); | ||
| if (!parser.hasCurrentToken()) { | ||
| return ReadState.END_OF_STREAM; | ||
| } else if (token != JsonToken.START_OBJECT) { | ||
| throw new IllegalStateException(String.format("Cannot read from the middle of a record. Current token was %s", token)); | ||
| } | ||
| writer.rootAsMap().bit("count").writeBit(1); | ||
| parser.skipChildren(); | ||
| return writer.ok() ? ReadState.WRITE_SUCCEED : ReadState.WRITE_FAILURE; | ||
| } | ||
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| @Override | ||
| public void ensureAtLeastOneField(BaseWriter.ComplexWriter writer) { | ||
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| } | ||
| } |
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