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remove json column v4 format writers #17625

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remove json column v4 format writers #17625

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6ee907c
remove json column v4 format writers
clintropolis Jan 14, 2025
511d747
fixes
clintropolis Jan 14, 2025
8bc2859
fix test
clintropolis Jan 15, 2025
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2 changes: 1 addition & 1 deletion ...ulti-stage-query/src/test/java/org/apache/druid/msq/indexing/MSQCompactionRunnerTest.java
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Original file line number Diff line number Diff line change
Expand Up @@ -102,7 +102,7 @@ public class MSQCompactionRunnerTest
private static final StringDimensionSchema STRING_DIMENSION = new StringDimensionSchema("string_dim", null, false);
private static final StringDimensionSchema MV_STRING_DIMENSION = new StringDimensionSchema("mv_string_dim", null, null);
private static final LongDimensionSchema LONG_DIMENSION = new LongDimensionSchema("long_dim");
private static final NestedDataColumnSchema NESTED_DIMENSION = new NestedDataColumnSchema("nested_dim", 4);
private static final NestedDataColumnSchema NESTED_DIMENSION = new NestedDataColumnSchema("nested_dim", 5);
private static final AutoTypeColumnSchema AUTO_DIMENSION = new AutoTypeColumnSchema("auto_dim", null);
private static final List<DimensionSchema> DIMENSIONS = ImmutableList.of(
STRING_DIMENSION,
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19 changes: 1 addition & 18 deletions processing/src/main/java/org/apache/druid/guice/BuiltInTypesModule.java
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Original file line number Diff line number Diff line change
Expand Up @@ -32,7 +32,6 @@
import org.apache.druid.segment.DimensionHandlerProvider;
import org.apache.druid.segment.DimensionHandlerUtils;
import org.apache.druid.segment.NestedCommonFormatColumnHandler;
import org.apache.druid.segment.NestedDataColumnHandlerV4;
import org.apache.druid.segment.nested.NestedDataComplexTypeSerde;
import org.apache.druid.segment.nested.StructuredData;
import org.apache.druid.segment.nested.StructuredDataJsonSerializer;
Expand Down Expand Up @@ -72,12 +71,7 @@ public void configure(Binder binder)
@LazySingleton
public SideEffectRegisterer initDimensionHandlerAndMvHandlingMode(DefaultColumnFormatConfig formatsConfig)
{
if (formatsConfig.getNestedColumnFormatVersion() != null && formatsConfig.getNestedColumnFormatVersion() == 4) {
DimensionHandlerUtils.registerDimensionHandlerProvider(
NestedDataComplexTypeSerde.TYPE_NAME,
new NestedColumnV4HandlerProvider()
);
} else {
if (formatsConfig.getNestedColumnFormatVersion() == null || formatsConfig.getNestedColumnFormatVersion() == 5) {
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I was hoping there would be a place where we fail the query/service if nestedColVersion is set to 4. Could not find such a guardrail. Is that not required ?

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A failure would happen in DefaultColumnFormatConfig which throws an exception if the format is not 5.

I guess I could think about switching this over to use the PropertiesValidator introduced in #17634, though this config itself isn't really deprecated, I did intend that thing to be used for validation of runtime.properties.

The more I think about it, I'm not actually sure failing is that useful, since v5 isn't really much of a behavior change, the risk is that with v5 segments you cannot roll back to Druid versions older than 26.0.0, which was covered in prior release notes and doesn't seem to be worth exploding over. The main difference of v5 format is that there are nested array fields which means you can use json_value function to get arrays of primitives out more efficiently and there are optimizations for the cases where there are no actual objects in a json column (e.g. it writes a scalar column instead if there is no nesting), so there isn't really much of a behavioral risk to using the new format.

I think we could also consider just log.warn about having a bad config value that is no longer supported and just ignoring it, though I suppose older druid versions also fail if you didn't put the value of 4 or 5 into the config, so 🤷

DimensionHandlerUtils.registerDimensionHandlerProvider(
NestedDataComplexTypeSerde.TYPE_NAME,
new NestedCommonFormatHandlerProvider()
Expand Down Expand Up @@ -144,17 +138,6 @@ public DimensionHandler<StructuredData, StructuredData, StructuredData> get(Stri
}
}

public static class NestedColumnV4HandlerProvider
implements DimensionHandlerProvider<StructuredData, StructuredData, StructuredData>
{

@Override
public DimensionHandler<StructuredData, StructuredData, StructuredData> get(String dimensionName)
{
return new NestedDataColumnHandlerV4(dimensionName);
}
}

/**
* this is used as a vehicle to register the correct version of the system default nested column handler and multi
* value handling mode by side effect with the help of binding to
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2 changes: 1 addition & 1 deletion processing/src/main/java/org/apache/druid/segment/DefaultColumnFormatConfig.java
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Expand Up @@ -33,7 +33,7 @@ public class DefaultColumnFormatConfig
public static void validateNestedFormatVersion(@Nullable Integer formatVersion)
{
if (formatVersion != null) {
if (formatVersion < 4 || formatVersion > 5) {
if (formatVersion != 5) {
throw DruidException.forPersona(DruidException.Persona.USER)
.ofCategory(DruidException.Category.INVALID_INPUT)
.build("Unsupported nested column format version[%s]", formatVersion);
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108 changes: 0 additions & 108 deletions processing/src/main/java/org/apache/druid/segment/NestedDataColumnHandlerV4.java
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