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[REVIEW PURPOSE] Add TO_HEX and FROM_HEX implementation in Java #24

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[REVIEW PURPOSE] Add TO_HEX and FROM_HEX implementation in Java #24

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56 changes: 53 additions & 3 deletions sabot/kernel/src/main/java/com/dremio/exec/expr/fn/impl/StringFunctions.java
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Original file line number Diff line number Diff line change
Expand Up @@ -1481,7 +1481,7 @@ public void eval() {
}
}

@FunctionTemplate(name = "from_hex", scope = FunctionScope.SIMPLE, nulls = NullHandling.NULL_IF_NULL)
@FunctionTemplate(names = {"from_hex", "unhex"}, scope = FunctionScope.SIMPLE, nulls = NullHandling.NULL_IF_NULL)
public static class FromHex implements SimpleFunction {
@Param VarCharHolder in;
@Output VarBinaryHolder out;
Expand All @@ -1501,8 +1501,8 @@ public void eval() {
}
}

@FunctionTemplate(name = "to_hex", scope = FunctionScope.SIMPLE, nulls = NullHandling.NULL_IF_NULL)
public static class ToHex implements SimpleFunction {
@FunctionTemplate(names = {"hex", "to_hex"}, scope = FunctionScope.SIMPLE, nulls = NullHandling.NULL_IF_NULL)
public static class ToHexVarBinary implements SimpleFunction {
@Param VarBinaryHolder in;
@Output VarCharHolder out;
@Workspace Charset charset;
Expand Down Expand Up @@ -1717,4 +1717,54 @@ public void eval() {
out.end = outBytea.length;
}
}

@FunctionTemplate(names = {"hex", "to_hex"}, scope = FunctionScope.SIMPLE, nulls = NullHandling.NULL_IF_NULL)
public static class ToHexVarChar implements SimpleFunction {
@Param VarCharHolder in;
@Output VarCharHolder out;
@Workspace Charset charset;
@Inject ArrowBuf buffer;

@Override
public void setup() {
charset = java.nio.charset.Charset.forName("UTF-8");
}

@Override
public void eval() {
byte[] buf = com.dremio.common.util.DremioStringUtils.toBinaryStringNoFormat(io.netty.buffer.NettyArrowBuf.unwrapBuffer(in.buffer), in
.start, in.end).getBytes(charset);
out.buffer = buffer = buffer.reallocIfNeeded(buf.length);
buffer.setBytes(0, buf);
buffer.setIndex(0, buf.length);

out.start = 0;
out.end = buf.length;
out.buffer = buffer;
}
}

@FunctionTemplate(names = {"hex", "to_hex"}, scope = FunctionScope.SIMPLE, nulls = NullHandling.NULL_IF_NULL)
public static class ToHexBigInt implements SimpleFunction{
@Param BigIntHolder in;
@Output VarCharHolder out;
@Workspace Charset charset;
@Inject ArrowBuf buffer;

@Override
public void setup() {
charset = java.nio.charset.Charset.forName("UTF-8");
}

@Override
public void eval() {
String hex_format = String.format("%X", in.value);
byte[] buf = hex_format.getBytes();
buffer.setBytes(0, buf);

out.start = 0;
out.end = buf.length;
out.buffer = buffer;
}
}
}