lamber-ken commented on issue #3401: [CARBONDATA-3528] refactor java checkstyle rules
URL:
https://github.com/apache/carbondata/pull/3401#issuecomment-544375668
> @lamber-ken :
> Please update the description and I have some questions ?
>
> 1. Why this change now ? what is the problem with current check style ? these new rules are taken from which reference or project ?
> 2. Why only java checkstyle modification ? why not scala check style also ?
> 3. After adding these rules ? no issues found in carbon ?
hi, @ajantha-bhat,
This issus just fucus on java checkstyle, it's a big work to refactor java checkstyle already, scala checkstyle needs a new thread to refactor. And some new rules, for example bellow.
you can check rulues by `mvn org.apache.maven.plugins:maven-checkstyle-plugin:2.17:check`.
#### RedundantImport (org.apache.carbondata.core.scan.expression.MatchExpression)
```
import org.apache.carbondata.common.annotations.InterfaceAudience;
import org.apache.carbondata.core.metadata.datatype.DataTypes;
import org.apache.carbondata.core.scan.expression.Expression;
import org.apache.carbondata.core.scan.expression.ExpressionResult;
import org.apache.carbondata.core.scan.expression.exception.FilterIllegalMemberException;
import org.apache.carbondata.core.scan.expression.exception.FilterUnsupportedException;
import org.apache.carbondata.core.scan.filter.intf.ExpressionType;
import org.apache.carbondata.core.scan.filter.intf.RowIntf;
```
#### @Override (org.apache.carbondata.datamap.PreAggregateDataMapProvider)
```
@Override
public boolean supportRebuild() {
return false;
}
@Override public boolean rebuildInternal(String newLoadName, Map<String, List<String>> segmentMap,
CarbonTable carbonTable) {
return false;
}
```
#### AvoidStarImport (org.apache.carbondata.tool.DataSummary)
```
import java.io.File;
import java.io.IOException;
import java.nio.charset.Charset;
import java.util.*;
```
#### EmptyStatement (org.apache.carbondata.datamap.lucene.LuceneDataMapFactoryBase)
```
// validate DataMapSchema and get index columns
indexedCarbonColumns = carbonTable.getIndexedColumns(dataMapSchema);;
flushCacheSize = validateAndGetWriteCacheSize(dataMapSchema);
storeBlockletWise = validateAndGetStoreBlockletWise(dataMapSchema);
```
and so on.
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