Github user chenliang613 commented on a diff in the pull request:
https://github.com/apache/carbondata/pull/1257#discussion_r133377510
--- Diff:
integration/presto/src/main/java/org/apache/carbondata/presto/readers/DecimalSliceStreamReader.java
---
@@ -0,0 +1,103 @@
+package org.apache.carbondata.presto.readers;
+
+import java.io.IOException;
+import java.math.BigDecimal;
+import java.math.BigInteger;
+
+import com.facebook.presto.spi.block.Block;
+import com.facebook.presto.spi.block.BlockBuilder;
+import com.facebook.presto.spi.block.BlockBuilderStatus;
+import com.facebook.presto.spi.type.DecimalType;
+import com.facebook.presto.spi.type.Decimals;
+import com.facebook.presto.spi.type.Type;
+import io.airlift.slice.Slice;
+
+import static com.facebook.presto.spi.type.Decimals.encodeUnscaledValue;
+import static com.facebook.presto.spi.type.Decimals.isShortDecimal;
+import static com.facebook.presto.spi.type.Decimals.rescale;
+import static com.google.common.base.Preconditions.checkArgument;
+import static com.google.common.base.Preconditions.checkState;
+import static io.airlift.slice.Slices.utf8Slice;
+import static java.math.RoundingMode.HALF_UP;
+
+public class DecimalSliceStreamReader implements StreamReader {
--- End diff --
This pr is optimizing for column reader, why need to add StreamReader ?
please consider using different PR to implement different features.
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