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Add decimal example #1

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2 changes: 2 additions & 0 deletions src/main/java/com/canner/udf/UdfPlugin.java
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,7 @@
import com.canner.udf.scalar.EncryptDecryptWithKey;
import com.canner.udf.scalar.ExtendedHashFunction;
import com.canner.udf.scalar.MathOperation;
import com.canner.udf.scalar.MathOperation.MathOP;
import com.canner.udf.scalar.TimestampSeqNo;
import com.canner.udf.scalar.TimestampWithTZSeqNo;
import io.trino.spi.Plugin;
Expand Down Expand Up @@ -47,6 +48,7 @@ public Set<Class<?>> getFunctions()
functions.add(TimestampWithTZSeqNo.class);
// load udfs in MathOperation class
functions.add(MathOperation.class);
functions.add(MathOP.class);

return Collections.unmodifiableSet(functions);
}
Expand Down
32 changes: 32 additions & 0 deletions src/main/java/com/canner/udf/scalar/MathOperation.java
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Original file line number Diff line number Diff line change
Expand Up @@ -16,10 +16,14 @@
package com.canner.udf.scalar;

import io.trino.spi.function.Description;
import io.trino.spi.function.LiteralParameters;
import io.trino.spi.function.ScalarFunction;
import io.trino.spi.function.SqlType;
import io.trino.spi.type.Int128;
import io.trino.spi.type.StandardTypes;

import static io.trino.spi.type.Int128Math.add;

public class MathOperation
{
private MathOperation() {}
Expand All @@ -31,4 +35,32 @@ public static long mathOpAddBigInt(@SqlType(StandardTypes.BIGINT) long left, @Sq
{
return left + right;
}

@ScalarFunction("math_op")
@Description("math op")
public static final class MathOP
{
private MathOP() {}

// this is needed, otherwise mathOp(Int128, Int128) won't work
@LiteralParameters({"p", "s"})
@SqlType("decimal(p, s)")
public static long mathOp(@SqlType("decimal(p, s)") long left, @SqlType("decimal(p, s)") long right)
{
return left + right;
}

@LiteralParameters({"p", "s"})
@SqlType("decimal(p, s)")
public static Int128 mathOp(@SqlType("decimal(p, s)") Int128 left, @SqlType("decimal(p, s)") Int128 right)
{
long[] resultArray = new long[2];
add(
left.getHigh(), left.getLow(),
right.getHigh(), right.getLow(),
resultArray,
0);
return Int128.valueOf(resultArray);
}
}
}