[checkstyle] optimize java code checkstyle for AvoidStarImport rule
optimize java code checkstyle for AvoidStarImport rule
This closes #3492
diff --git a/common/src/main/java/org/apache/carbondata/common/annotations/InterfaceStability.java b/common/src/main/java/org/apache/carbondata/common/annotations/InterfaceStability.java
index 5435028..638e670 100644
--- a/common/src/main/java/org/apache/carbondata/common/annotations/InterfaceStability.java
+++ b/common/src/main/java/org/apache/carbondata/common/annotations/InterfaceStability.java
@@ -21,8 +21,6 @@
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
-import org.apache.carbondata.common.annotations.InterfaceAudience.*;
-
/**
* This annotation is ported and modified from Apache Hadoop project.
*
@@ -34,9 +32,9 @@
* 2. {@link Evolving} means compatibility can break at minor release (m.x)
* 3. {@link Unstable} means compatibility can break at any release
*
- * <ul><li>All classes that are annotated with {@link User} or
- * {@link Developer} must have InterfaceStability annotation. </li>
- * <li>Classes that are {@link Internal} are to be considered unstable unless
+ * <ul><li>All classes that are annotated with {@link InterfaceAudience.User} or
+ * {@link InterfaceAudience.Developer} must have InterfaceStability annotation. </li>
+ * <li>Classes that are {@link InterfaceAudience.Internal} are to be considered unstable unless
* a different InterfaceStability annotation states otherwise.</li>
* <li>Incompatible changes must not be made to classes marked as stable.</li>
* </ul>
diff --git a/core/src/main/java/org/apache/carbondata/core/datamap/DataMapProvider.java b/core/src/main/java/org/apache/carbondata/core/datamap/DataMapProvider.java
index 2a053ee..e58b61b 100644
--- a/core/src/main/java/org/apache/carbondata/core/datamap/DataMapProvider.java
+++ b/core/src/main/java/org/apache/carbondata/core/datamap/DataMapProvider.java
@@ -18,7 +18,12 @@
package org.apache.carbondata.core.datamap;
import java.io.IOException;
-import java.util.*;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
import org.apache.carbondata.common.annotations.InterfaceAudience;
import org.apache.carbondata.common.exceptions.sql.MalformedDataMapCommandException;
diff --git a/core/src/main/java/org/apache/carbondata/core/datastore/page/ColumnPage.java b/core/src/main/java/org/apache/carbondata/core/datastore/page/ColumnPage.java
index 4024bde..338f0b2 100644
--- a/core/src/main/java/org/apache/carbondata/core/datastore/page/ColumnPage.java
+++ b/core/src/main/java/org/apache/carbondata/core/datastore/page/ColumnPage.java
@@ -37,7 +37,13 @@
import org.apache.carbondata.core.metadata.datatype.DataTypes;
import org.apache.carbondata.core.util.CarbonProperties;
-import static org.apache.carbondata.core.metadata.datatype.DataTypes.*;
+import static org.apache.carbondata.core.metadata.datatype.DataTypes.BYTE;
+import static org.apache.carbondata.core.metadata.datatype.DataTypes.BYTE_ARRAY;
+import static org.apache.carbondata.core.metadata.datatype.DataTypes.DOUBLE;
+import static org.apache.carbondata.core.metadata.datatype.DataTypes.FLOAT;
+import static org.apache.carbondata.core.metadata.datatype.DataTypes.INT;
+import static org.apache.carbondata.core.metadata.datatype.DataTypes.LONG;
+import static org.apache.carbondata.core.metadata.datatype.DataTypes.SHORT;
public abstract class ColumnPage {
@@ -159,14 +165,14 @@
if (isUnsafeEnabled(columnPageEncoderMeta)) {
actualPage = new UnsafeVarLengthColumnPage(columnPageEncoderMeta, pageSize);
encodedPage = new UnsafeFixLengthColumnPage(
- new ColumnPageEncoderMeta(columnPageEncoderMeta.getColumnSpec(), DataTypes.BYTE_ARRAY,
+ new ColumnPageEncoderMeta(columnPageEncoderMeta.getColumnSpec(), BYTE_ARRAY,
columnPageEncoderMeta.getCompressorName()),
pageSize,
CarbonCommonConstants.LOCAL_DICT_ENCODED_BYTEARRAY_SIZE);
} else {
actualPage = new SafeVarLengthColumnPage(columnPageEncoderMeta, pageSize);
encodedPage = new SafeFixLengthColumnPage(
- new ColumnPageEncoderMeta(columnPageEncoderMeta.getColumnSpec(), DataTypes.BYTE_ARRAY,
+ new ColumnPageEncoderMeta(columnPageEncoderMeta.getColumnSpec(), BYTE_ARRAY,
columnPageEncoderMeta.getCompressorName()),
pageSize);
}
@@ -187,23 +193,23 @@
if (dataType == DataTypes.BOOLEAN) {
instance = new UnsafeFixLengthColumnPage(
new ColumnPageEncoderMeta(columnSpec, BYTE, compressorName), pageSize);
- } else if (dataType == DataTypes.BYTE ||
- dataType == DataTypes.SHORT ||
+ } else if (dataType == BYTE ||
+ dataType == SHORT ||
dataType == DataTypes.SHORT_INT ||
- dataType == DataTypes.INT ||
- dataType == DataTypes.LONG ||
+ dataType == INT ||
+ dataType == LONG ||
dataType == DataTypes.FLOAT ||
dataType == DataTypes.DOUBLE) {
instance = new UnsafeFixLengthColumnPage(
new ColumnPageEncoderMeta(columnSpec, dataType, compressorName), pageSize);
} else if (dataType == DataTypes.TIMESTAMP) {
instance = new UnsafeFixLengthColumnPage(
- new ColumnPageEncoderMeta(columnSpec, DataTypes.LONG, compressorName), pageSize);
+ new ColumnPageEncoderMeta(columnSpec, LONG, compressorName), pageSize);
} else if (DataTypes.isDecimal(dataType)) {
instance = new UnsafeDecimalColumnPage(
new ColumnPageEncoderMeta(columnSpec, dataType, compressorName), pageSize);
} else if (dataType == DataTypes.STRING
- || dataType == DataTypes.BYTE_ARRAY
+ || dataType == BYTE_ARRAY
|| dataType == DataTypes.VARCHAR
|| dataType == DataTypes.BINARY) {
instance = new UnsafeVarLengthColumnPage(
@@ -212,15 +218,15 @@
throw new RuntimeException("Unsupported data dataType: " + dataType);
}
} else {
- if (dataType == DataTypes.BOOLEAN || dataType == DataTypes.BYTE) {
+ if (dataType == DataTypes.BOOLEAN || dataType == BYTE) {
instance = newBytePage(columnPageEncoderMeta, new byte[pageSize]);
- } else if (dataType == DataTypes.SHORT) {
+ } else if (dataType == SHORT) {
instance = newShortPage(columnPageEncoderMeta, new short[pageSize]);
} else if (dataType == DataTypes.SHORT_INT) {
instance = newShortIntPage(columnPageEncoderMeta, new byte[pageSize * 3]);
- } else if (dataType == DataTypes.INT) {
+ } else if (dataType == INT) {
instance = newIntPage(columnPageEncoderMeta, new int[pageSize]);
- } else if (dataType == DataTypes.LONG || dataType == DataTypes.TIMESTAMP) {
+ } else if (dataType == LONG || dataType == DataTypes.TIMESTAMP) {
instance = newLongPage(
new ColumnPageEncoderMeta(columnPageEncoderMeta.getColumnSpec(), LONG,
columnPageEncoderMeta.getCompressorName()), new long[pageSize]);
@@ -231,7 +237,7 @@
} else if (DataTypes.isDecimal(dataType)) {
instance = newDecimalPage(columnPageEncoderMeta, new byte[pageSize][]);
} else if (dataType == DataTypes.STRING
- || dataType == DataTypes.BYTE_ARRAY
+ || dataType == BYTE_ARRAY
|| dataType == DataTypes.VARCHAR
|| dataType == DataTypes.BINARY) {
instance = new SafeVarLengthColumnPage(columnPageEncoderMeta, pageSize);
@@ -399,19 +405,19 @@
return;
}
DataType dataType = columnPageEncoderMeta.getStoreDataType();
- if (dataType == DataTypes.BOOLEAN || dataType == DataTypes.BYTE) {
+ if (dataType == DataTypes.BOOLEAN || dataType == BYTE) {
if (columnPageEncoderMeta.getColumnSpec().getSchemaDataType() == DataTypes.BOOLEAN) {
value = BooleanConvert.boolean2Byte((Boolean) value);
}
putByte(rowId, (byte) value);
statsCollector.update((byte) value);
- } else if (dataType == DataTypes.SHORT) {
+ } else if (dataType == SHORT) {
putShort(rowId, (short) value);
statsCollector.update((short) value);
- } else if (dataType == DataTypes.INT) {
+ } else if (dataType == INT) {
putInt(rowId, (int) value);
statsCollector.update((int) value);
- } else if (dataType == DataTypes.LONG) {
+ } else if (dataType == LONG) {
putLong(rowId, (long) value);
statsCollector.update((long) value);
} else if (dataType == DataTypes.DOUBLE) {
@@ -421,7 +427,7 @@
putDecimal(rowId, (BigDecimal) value);
statsCollector.update((BigDecimal) value);
} else if (dataType == DataTypes.STRING
- || dataType == DataTypes.BYTE_ARRAY
+ || dataType == BYTE_ARRAY
|| dataType == DataTypes.VARCHAR) {
putBytes(rowId, (byte[]) value);
statsCollector.update((byte[]) value);
@@ -446,24 +452,24 @@
return getNull(rowId);
}
DataType dataType = columnPageEncoderMeta.getStoreDataType();
- if (dataType == DataTypes.BOOLEAN || dataType == DataTypes.BYTE) {
+ if (dataType == DataTypes.BOOLEAN || dataType == BYTE) {
byte value = getByte(rowId);
if (columnPageEncoderMeta.getColumnSpec().getSchemaDataType() == DataTypes.BOOLEAN) {
return BooleanConvert.byte2Boolean(value);
}
return value;
- } else if (dataType == DataTypes.SHORT) {
+ } else if (dataType == SHORT) {
return getShort(rowId);
- } else if (dataType == DataTypes.INT) {
+ } else if (dataType == INT) {
return getInt(rowId);
- } else if (dataType == DataTypes.LONG) {
+ } else if (dataType == LONG) {
return getLong(rowId);
} else if (dataType == DataTypes.DOUBLE) {
return getDouble(rowId);
} else if (DataTypes.isDecimal(dataType)) {
return getDecimal(rowId);
} else if (dataType == DataTypes.STRING
- || dataType == DataTypes.BYTE_ARRAY
+ || dataType == BYTE_ARRAY
|| dataType == DataTypes.VARCHAR) {
return getBytes(rowId);
} else {
@@ -535,13 +541,13 @@
DataType dataType = columnPageEncoderMeta.getStoreDataType();
if (dataType == DataTypes.BOOLEAN) {
putBoolean(rowId, false);
- } else if (dataType == DataTypes.BYTE) {
+ } else if (dataType == BYTE) {
putByte(rowId, (byte) 0);
- } else if (dataType == DataTypes.SHORT) {
+ } else if (dataType == SHORT) {
putShort(rowId, (short) 0);
- } else if (dataType == DataTypes.INT) {
+ } else if (dataType == INT) {
putInt(rowId, 0);
- } else if (dataType == DataTypes.LONG) {
+ } else if (dataType == LONG) {
putLong(rowId, 0L);
} else if (dataType == DataTypes.DOUBLE) {
putDouble(rowId, 0.0);
@@ -562,16 +568,16 @@
DataType dataType = columnPageEncoderMeta.getStoreDataType();
if (dataType == DataTypes.BOOLEAN) {
result = getBoolean(rowId);
- } else if (dataType == DataTypes.BYTE) {
+ } else if (dataType == BYTE) {
result = getByte(rowId);
if (columnPageEncoderMeta.getColumnSpec().getSchemaDataType() == DataTypes.BOOLEAN) {
result = BooleanConvert.byte2Boolean((byte)result);
}
- } else if (dataType == DataTypes.SHORT) {
+ } else if (dataType == SHORT) {
result = getShort(rowId);
- } else if (dataType == DataTypes.INT) {
+ } else if (dataType == INT) {
result = getInt(rowId);
- } else if (dataType == DataTypes.LONG) {
+ } else if (dataType == LONG) {
result = getLong(rowId);
} else if (dataType == DataTypes.DOUBLE) {
result = getDouble(rowId);
@@ -722,15 +728,15 @@
DataType dataType = columnPageEncoderMeta.getStoreDataType();
if (dataType == DataTypes.BOOLEAN) {
return getBooleanPage().length;
- } else if (dataType == DataTypes.BYTE) {
+ } else if (dataType == BYTE) {
return getBytePage().length;
- } else if (dataType == DataTypes.SHORT) {
+ } else if (dataType == SHORT) {
return getShortPage().length * SHORT.getSizeInBytes();
} else if (dataType == DataTypes.SHORT_INT) {
return getShortIntPage().length;
- } else if (dataType == DataTypes.INT) {
+ } else if (dataType == INT) {
return getIntPage().length * INT.getSizeInBytes();
- } else if (dataType == DataTypes.LONG) {
+ } else if (dataType == LONG) {
return getLongPage().length * LONG.getSizeInBytes();
} else if (dataType == DataTypes.FLOAT) {
return getFloatPage().length * FLOAT.getSizeInBytes();
@@ -738,16 +744,16 @@
return getDoublePage().length * DOUBLE.getSizeInBytes();
} else if (DataTypes.isDecimal(dataType)) {
return getDecimalPage().length;
- } else if (dataType == DataTypes.BYTE_ARRAY
+ } else if (dataType == BYTE_ARRAY
&& columnPageEncoderMeta.getColumnSpec().getColumnType() == ColumnType.COMPLEX_PRIMITIVE) {
return getComplexChildrenLVFlattenedBytePage().length;
- } else if (dataType == DataTypes.BYTE_ARRAY
+ } else if (dataType == BYTE_ARRAY
&& (columnPageEncoderMeta.getColumnSpec().getColumnType() == ColumnType.COMPLEX_STRUCT
|| columnPageEncoderMeta.getColumnSpec().getColumnType() == ColumnType.COMPLEX_ARRAY
|| columnPageEncoderMeta.getColumnSpec().getColumnType() == ColumnType.PLAIN_LONG_VALUE
|| columnPageEncoderMeta.getColumnSpec().getColumnType() == ColumnType.PLAIN_VALUE)) {
return getComplexParentFlattenedBytePage().length;
- } else if (dataType == DataTypes.BYTE_ARRAY) {
+ } else if (dataType == BYTE_ARRAY) {
return getLVFlattenedBytePage().length;
} else {
throw new UnsupportedOperationException("unsupported compress column page: " + dataType);
@@ -761,15 +767,15 @@
DataType dataType = columnPageEncoderMeta.getStoreDataType();
if (dataType == DataTypes.BOOLEAN) {
return compressor.compressByte(getBooleanPage());
- } else if (dataType == DataTypes.BYTE) {
+ } else if (dataType == BYTE) {
return compressor.compressByte(getBytePage());
- } else if (dataType == DataTypes.SHORT) {
+ } else if (dataType == SHORT) {
return compressor.compressShort(getShortPage());
} else if (dataType == DataTypes.SHORT_INT) {
return compressor.compressByte(getShortIntPage());
- } else if (dataType == DataTypes.INT) {
+ } else if (dataType == INT) {
return compressor.compressInt(getIntPage());
- } else if (dataType == DataTypes.LONG) {
+ } else if (dataType == LONG) {
return compressor.compressLong(getLongPage());
} else if (dataType == DataTypes.FLOAT) {
return compressor.compressFloat(getFloatPage());
@@ -777,10 +783,10 @@
return compressor.compressDouble(getDoublePage());
} else if (DataTypes.isDecimal(dataType)) {
return compressor.compressByte(getDecimalPage());
- } else if (dataType == DataTypes.BYTE_ARRAY
+ } else if (dataType == BYTE_ARRAY
&& columnPageEncoderMeta.getColumnSpec().getColumnType() == ColumnType.COMPLEX_PRIMITIVE) {
return compressor.compressByte(getComplexChildrenLVFlattenedBytePage());
- } else if (dataType == DataTypes.BYTE_ARRAY
+ } else if (dataType == BYTE_ARRAY
&& (columnPageEncoderMeta.getColumnSpec().getColumnType() == ColumnType.COMPLEX_STRUCT
|| columnPageEncoderMeta.getColumnSpec().getColumnType() == ColumnType.COMPLEX_ARRAY
|| columnPageEncoderMeta.getColumnSpec().getColumnType() == ColumnType.PLAIN_LONG_VALUE
@@ -788,7 +794,7 @@
return compressor.compressByte(getComplexParentFlattenedBytePage());
} else if (dataType == DataTypes.BINARY) {
return getLVFlattenedBytePage();
- } else if (dataType == DataTypes.BYTE_ARRAY) {
+ } else if (dataType == BYTE_ARRAY) {
return compressor.compressByte(getLVFlattenedBytePage());
} else {
throw new UnsupportedOperationException("unsupported compress column page: " + dataType);
@@ -805,19 +811,19 @@
Compressor compressor = CompressorFactory.getInstance().getCompressor(meta.getCompressorName());
TableSpec.ColumnSpec columnSpec = meta.getColumnSpec();
DataType storeDataType = meta.getStoreDataType();
- if (storeDataType == DataTypes.BOOLEAN || storeDataType == DataTypes.BYTE) {
+ if (storeDataType == DataTypes.BOOLEAN || storeDataType == BYTE) {
byte[] byteData = compressor.unCompressByte(compressedData, offset, length);
return newBytePage(meta, byteData);
- } else if (storeDataType == DataTypes.SHORT) {
+ } else if (storeDataType == SHORT) {
short[] shortData = compressor.unCompressShort(compressedData, offset, length);
return newShortPage(meta, shortData);
} else if (storeDataType == DataTypes.SHORT_INT) {
byte[] shortIntData = compressor.unCompressByte(compressedData, offset, length);
return newShortIntPage(meta, shortIntData);
- } else if (storeDataType == DataTypes.INT) {
+ } else if (storeDataType == INT) {
int[] intData = compressor.unCompressInt(compressedData, offset, length);
return newIntPage(meta, intData);
- } else if (storeDataType == DataTypes.LONG) {
+ } else if (storeDataType == LONG) {
long[] longData = compressor.unCompressLong(compressedData, offset, length);
return newLongPage(meta, longData);
} else if (storeDataType == DataTypes.FLOAT) {
@@ -826,32 +832,32 @@
} else if (storeDataType == DataTypes.DOUBLE) {
double[] doubleData = compressor.unCompressDouble(compressedData, offset, length);
return newDoublePage(meta, doubleData);
- } else if (!isLVEncoded && storeDataType == DataTypes.BYTE_ARRAY && (
+ } else if (!isLVEncoded && storeDataType == BYTE_ARRAY && (
columnSpec.getColumnType() == ColumnType.COMPLEX_PRIMITIVE
|| columnSpec.getColumnType() == ColumnType.PLAIN_VALUE)) {
byte[] lvVarBytes = compressor.unCompressByte(compressedData, offset, length);
return newComplexLVBytesPage(columnSpec, lvVarBytes,
CarbonCommonConstants.SHORT_SIZE_IN_BYTE, meta.getCompressorName());
- } else if (isLVEncoded && storeDataType == DataTypes.BYTE_ARRAY &&
+ } else if (isLVEncoded && storeDataType == BYTE_ARRAY &&
columnSpec.getColumnType() == ColumnType.COMPLEX_PRIMITIVE) {
byte[] lvVarBytes = compressor.unCompressByte(compressedData, offset, length);
return newFixedByteArrayPage(columnSpec, lvVarBytes, 3, meta.getCompressorName());
- } else if (storeDataType == DataTypes.BYTE_ARRAY
+ } else if (storeDataType == BYTE_ARRAY
&& columnSpec.getColumnType() == ColumnType.COMPLEX_STRUCT) {
byte[] lvVarBytes = compressor.unCompressByte(compressedData, offset, length);
return newFixedByteArrayPage(columnSpec, lvVarBytes,
CarbonCommonConstants.SHORT_SIZE_IN_BYTE, meta.getCompressorName());
- } else if (storeDataType == DataTypes.BYTE_ARRAY
+ } else if (storeDataType == BYTE_ARRAY
&& columnSpec.getColumnType() == ColumnType.COMPLEX_ARRAY) {
byte[] lvVarBytes = compressor.unCompressByte(compressedData, offset, length);
return newFixedByteArrayPage(columnSpec, lvVarBytes,
CarbonCommonConstants.LONG_SIZE_IN_BYTE, meta.getCompressorName());
- } else if (storeDataType == DataTypes.BYTE_ARRAY
+ } else if (storeDataType == BYTE_ARRAY
&& columnSpec.getColumnType() == ColumnType.PLAIN_LONG_VALUE) {
byte[] lvVarBytes = compressor.unCompressByte(compressedData, offset, length);
return newLVBytesPage(columnSpec, lvVarBytes,
CarbonCommonConstants.INT_SIZE_IN_BYTE, meta.getCompressorName());
- } else if (storeDataType == DataTypes.BYTE_ARRAY) {
+ } else if (storeDataType == BYTE_ARRAY) {
byte[] lvVarBytes = compressor.unCompressByte(compressedData, offset, length);
return newLVBytesPage(columnSpec, lvVarBytes,
CarbonCommonConstants.INT_SIZE_IN_BYTE, meta.getCompressorName());
@@ -869,12 +875,12 @@
Compressor compressor = CompressorFactory.getInstance().getCompressor(meta.getCompressorName());
ColumnPage decimalPage;
DataType storeDataType = meta.getStoreDataType();
- if (storeDataType == DataTypes.BYTE) {
+ if (storeDataType == BYTE) {
byte[] byteData = compressor.unCompressByte(compressedData, offset, length);
decimalPage = createDecimalPage(meta, byteData.length);
decimalPage.setBytePage(byteData);
return decimalPage;
- } else if (storeDataType == DataTypes.SHORT) {
+ } else if (storeDataType == SHORT) {
short[] shortData = compressor.unCompressShort(compressedData, offset, length);
decimalPage = createDecimalPage(meta, shortData.length);
decimalPage.setShortPage(shortData);
@@ -884,12 +890,12 @@
decimalPage = createDecimalPage(meta, shortIntData.length / 3);
decimalPage.setShortIntPage(shortIntData);
return decimalPage;
- } else if (storeDataType == DataTypes.INT) {
+ } else if (storeDataType == INT) {
int[] intData = compressor.unCompressInt(compressedData, offset, length);
decimalPage = createDecimalPage(meta, intData.length);
decimalPage.setIntPage(intData);
return decimalPage;
- } else if (storeDataType == DataTypes.LONG) {
+ } else if (storeDataType == LONG) {
long[] longData = compressor.unCompressLong(compressedData, offset, length);
decimalPage = createDecimalPage(meta, longData.length);
decimalPage.setLongPage(longData);
diff --git a/core/src/main/java/org/apache/carbondata/core/indexstore/blockletindex/BlockletDataMapFactory.java b/core/src/main/java/org/apache/carbondata/core/indexstore/blockletindex/BlockletDataMapFactory.java
index 85f7aeb..8e8a80b 100644
--- a/core/src/main/java/org/apache/carbondata/core/indexstore/blockletindex/BlockletDataMapFactory.java
+++ b/core/src/main/java/org/apache/carbondata/core/indexstore/blockletindex/BlockletDataMapFactory.java
@@ -18,7 +18,13 @@
package org.apache.carbondata.core.indexstore.blockletindex;
import java.io.IOException;
-import java.util.*;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.UUID;
import java.util.concurrent.ConcurrentHashMap;
import org.apache.carbondata.core.cache.Cache;
diff --git a/core/src/main/java/org/apache/carbondata/core/metadata/SegmentFileStore.java b/core/src/main/java/org/apache/carbondata/core/metadata/SegmentFileStore.java
index 0fe92e1..caf1328 100644
--- a/core/src/main/java/org/apache/carbondata/core/metadata/SegmentFileStore.java
+++ b/core/src/main/java/org/apache/carbondata/core/metadata/SegmentFileStore.java
@@ -17,9 +17,23 @@
package org.apache.carbondata.core.metadata;
-import java.io.*;
+import java.io.BufferedReader;
+import java.io.BufferedWriter;
+import java.io.DataInputStream;
+import java.io.DataOutputStream;
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.io.OutputStreamWriter;
+import java.io.Serializable;
import java.nio.charset.Charset;
-import java.util.*;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
import org.apache.carbondata.common.logging.LogServiceFactory;
import org.apache.carbondata.core.constants.CarbonCommonConstants;
diff --git a/core/src/main/java/org/apache/carbondata/core/metadata/schema/table/TableSchema.java b/core/src/main/java/org/apache/carbondata/core/metadata/schema/table/TableSchema.java
index 77db3f6..33b6016 100644
--- a/core/src/main/java/org/apache/carbondata/core/metadata/schema/table/TableSchema.java
+++ b/core/src/main/java/org/apache/carbondata/core/metadata/schema/table/TableSchema.java
@@ -17,7 +17,15 @@
package org.apache.carbondata.core.metadata.schema.table;
-import java.io.*;
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.DataInput;
+import java.io.DataInputStream;
+import java.io.DataOutput;
+import java.io.DataOutputStream;
+import java.io.IOException;
+import java.io.Serializable;
+import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
diff --git a/core/src/main/java/org/apache/carbondata/core/scan/collector/ResultCollectorFactory.java b/core/src/main/java/org/apache/carbondata/core/scan/collector/ResultCollectorFactory.java
index 48a6ee6..56985fe 100644
--- a/core/src/main/java/org/apache/carbondata/core/scan/collector/ResultCollectorFactory.java
+++ b/core/src/main/java/org/apache/carbondata/core/scan/collector/ResultCollectorFactory.java
@@ -18,7 +18,16 @@
package org.apache.carbondata.core.scan.collector;
import org.apache.carbondata.common.logging.LogServiceFactory;
-import org.apache.carbondata.core.scan.collector.impl.*;
+import org.apache.carbondata.core.scan.collector.impl.AbstractScannedResultCollector;
+import org.apache.carbondata.core.scan.collector.impl.DictionaryBasedResultCollector;
+import org.apache.carbondata.core.scan.collector.impl.DictionaryBasedVectorResultCollector;
+import org.apache.carbondata.core.scan.collector.impl.RawBasedResultCollector;
+import org.apache.carbondata.core.scan.collector.impl.RestructureBasedDictionaryResultCollector;
+import org.apache.carbondata.core.scan.collector.impl.RestructureBasedRawResultCollector;
+import org.apache.carbondata.core.scan.collector.impl.RestructureBasedVectorResultCollector;
+import org.apache.carbondata.core.scan.collector.impl.RowIdBasedResultCollector;
+import org.apache.carbondata.core.scan.collector.impl.RowIdRawBasedResultCollector;
+import org.apache.carbondata.core.scan.collector.impl.RowIdRestructureBasedRawResultCollector;
import org.apache.carbondata.core.scan.executor.infos.BlockExecutionInfo;
import org.apache.log4j.Logger;
diff --git a/core/src/main/java/org/apache/carbondata/core/util/CarbonUtil.java b/core/src/main/java/org/apache/carbondata/core/util/CarbonUtil.java
index a90bd32..0b83a838 100644
--- a/core/src/main/java/org/apache/carbondata/core/util/CarbonUtil.java
+++ b/core/src/main/java/org/apache/carbondata/core/util/CarbonUtil.java
@@ -17,12 +17,32 @@
package org.apache.carbondata.core.util;
-import java.io.*;
+import java.io.BufferedReader;
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.Closeable;
+import java.io.DataInputStream;
+import java.io.DataOutputStream;
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.ObjectInputStream;
+import java.io.UnsupportedEncodingException;
import java.math.BigDecimal;
import java.nio.ByteBuffer;
import java.nio.charset.Charset;
import java.security.PrivilegedExceptionAction;
-import java.util.*;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Locale;
+import java.util.Map;
+import java.util.Set;
+import java.util.UUID;
import org.apache.carbondata.common.logging.LogServiceFactory;
import org.apache.carbondata.core.cache.dictionary.Dictionary;
diff --git a/core/src/main/java/org/apache/carbondata/core/util/SessionParams.java b/core/src/main/java/org/apache/carbondata/core/util/SessionParams.java
index 0e68be5..481bdb1 100644
--- a/core/src/main/java/org/apache/carbondata/core/util/SessionParams.java
+++ b/core/src/main/java/org/apache/carbondata/core/util/SessionParams.java
@@ -30,7 +30,18 @@
import org.apache.carbondata.core.constants.CarbonLoadOptionConstants;
import org.apache.carbondata.core.exception.InvalidConfigurationException;
-import static org.apache.carbondata.core.constants.CarbonCommonConstants.*;
+import static org.apache.carbondata.core.constants.CarbonCommonConstants.CARBON_CUSTOM_BLOCK_DISTRIBUTION;
+import static org.apache.carbondata.core.constants.CarbonCommonConstants.CARBON_ENABLE_INDEX_SERVER;
+import static org.apache.carbondata.core.constants.CarbonCommonConstants.CARBON_MAJOR_COMPACTION_SIZE;
+import static org.apache.carbondata.core.constants.CarbonCommonConstants.CARBON_PUSH_ROW_FILTERS_FOR_VECTOR;
+import static org.apache.carbondata.core.constants.CarbonCommonConstants.COMPACTION_SEGMENT_LEVEL_THRESHOLD;
+import static org.apache.carbondata.core.constants.CarbonCommonConstants.ENABLE_AUTO_LOAD_MERGE;
+import static org.apache.carbondata.core.constants.CarbonCommonConstants.ENABLE_OFFHEAP_SORT;
+import static org.apache.carbondata.core.constants.CarbonCommonConstants.ENABLE_UNSAFE_IN_QUERY_EXECUTION;
+import static org.apache.carbondata.core.constants.CarbonCommonConstants.ENABLE_UNSAFE_SORT;
+import static org.apache.carbondata.core.constants.CarbonCommonConstants.ENABLE_VECTOR_READER;
+import static org.apache.carbondata.core.constants.CarbonCommonConstants.NUM_CORES_COMPACTING;
+import static org.apache.carbondata.core.constants.CarbonCommonConstants.NUM_CORES_LOADING;
import static org.apache.carbondata.core.constants.CarbonLoadOptionConstants.CARBON_OPTIONS_BAD_RECORDS_ACTION;
import static org.apache.carbondata.core.constants.CarbonLoadOptionConstants.CARBON_OPTIONS_BAD_RECORDS_LOGGER_ENABLE;
import static org.apache.carbondata.core.constants.CarbonLoadOptionConstants.CARBON_OPTIONS_BAD_RECORD_PATH;
diff --git a/dev/javastyle-config.xml b/dev/javastyle-config.xml
index bab54af..824cbc8 100644
--- a/dev/javastyle-config.xml
+++ b/dev/javastyle-config.xml
@@ -176,9 +176,7 @@
</module>
<!-- Checks for star import. -->
- <module name="AvoidStarImport">
- <property name="severity" value="info"/>
- </module>
+ <module name="AvoidStarImport"/>
<!-- Checks for placement of the left curly brace ('{'). -->
<module name="LeftCurly"/>
diff --git a/hadoop/src/main/java/org/apache/carbondata/hadoop/util/CarbonVectorizedRecordReader.java b/hadoop/src/main/java/org/apache/carbondata/hadoop/util/CarbonVectorizedRecordReader.java
index b29d1b0..d03a252 100644
--- a/hadoop/src/main/java/org/apache/carbondata/hadoop/util/CarbonVectorizedRecordReader.java
+++ b/hadoop/src/main/java/org/apache/carbondata/hadoop/util/CarbonVectorizedRecordReader.java
@@ -19,7 +19,10 @@
import java.io.IOException;
import java.nio.ByteBuffer;
-import java.util.*;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
import org.apache.carbondata.common.logging.LogServiceFactory;
import org.apache.carbondata.core.constants.CarbonV3DataFormatConstants;
diff --git a/integration/presto/src/main/java/org/apache/carbondata/presto/CarbondataConnectorFactory.java b/integration/presto/src/main/java/org/apache/carbondata/presto/CarbondataConnectorFactory.java
index e264189..1284237 100755
--- a/integration/presto/src/main/java/org/apache/carbondata/presto/CarbondataConnectorFactory.java
+++ b/integration/presto/src/main/java/org/apache/carbondata/presto/CarbondataConnectorFactory.java
@@ -18,7 +18,10 @@
package org.apache.carbondata.presto;
import java.lang.management.ManagementFactory;
-import java.lang.reflect.*;
+import java.lang.reflect.Constructor;
+import java.lang.reflect.Field;
+import java.lang.reflect.Method;
+import java.lang.reflect.Modifier;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
diff --git a/integration/presto/src/main/java/org/apache/carbondata/presto/CarbondataSplitManager.java b/integration/presto/src/main/java/org/apache/carbondata/presto/CarbondataSplitManager.java
index 50dcdc8..0147b75 100755
--- a/integration/presto/src/main/java/org/apache/carbondata/presto/CarbondataSplitManager.java
+++ b/integration/presto/src/main/java/org/apache/carbondata/presto/CarbondataSplitManager.java
@@ -17,7 +17,14 @@
package org.apache.carbondata.presto;
-import java.util.*;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.OptionalInt;
+import java.util.Properties;
import java.util.concurrent.ExecutorService;
import java.util.function.Function;
diff --git a/tools/cli/src/main/java/org/apache/carbondata/tool/DataSummary.java b/tools/cli/src/main/java/org/apache/carbondata/tool/DataSummary.java
index b3f6878..db957b7 100644
--- a/tools/cli/src/main/java/org/apache/carbondata/tool/DataSummary.java
+++ b/tools/cli/src/main/java/org/apache/carbondata/tool/DataSummary.java
@@ -20,7 +20,14 @@
import java.io.File;
import java.io.IOException;
import java.nio.charset.Charset;
-import java.util.*;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.LinkedHashMap;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Map;
import org.apache.carbondata.common.Strings;
import org.apache.carbondata.core.constants.CarbonCommonConstants;
diff --git a/tools/cli/src/main/java/org/apache/carbondata/tool/FileCollector.java b/tools/cli/src/main/java/org/apache/carbondata/tool/FileCollector.java
index ab25d80..69a070e 100644
--- a/tools/cli/src/main/java/org/apache/carbondata/tool/FileCollector.java
+++ b/tools/cli/src/main/java/org/apache/carbondata/tool/FileCollector.java
@@ -18,7 +18,14 @@
package org.apache.carbondata.tool;
import java.io.IOException;
-import java.util.*;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.HashSet;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
import org.apache.carbondata.common.Strings;
import org.apache.carbondata.core.constants.CarbonCommonConstants;
