org.apache.hadoop.hive.ql.udf.UDFAtan Maven / Gradle / Ivy
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* to you under the Apache License, Version 2.0 (the
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* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.hadoop.hive.ql.udf;
import org.apache.hadoop.hive.ql.exec.Description;
import org.apache.hadoop.hive.ql.exec.vector.VectorizedExpressions;
import org.apache.hadoop.hive.ql.exec.vector.expressions.gen.FuncATanDoubleToDouble;
import org.apache.hadoop.hive.ql.exec.vector.expressions.gen.FuncATanLongToDouble;
import org.apache.hadoop.hive.serde2.io.DoubleWritable;
@Description(name = "atan",
value = "_FUNC_(x) - returns the atan (arctan) of x (x is in radians)",
extended = "Example:\n "
+ " > SELECT _FUNC_(0) FROM src LIMIT 1;\n"
+ " 0"
)
@VectorizedExpressions({FuncATanLongToDouble.class, FuncATanDoubleToDouble.class})
public class UDFAtan extends UDFMath {
private final DoubleWritable result = new DoubleWritable();
@Override
protected DoubleWritable doEvaluate(DoubleWritable a) {
result.set(Math.atan(a.get()));
return result;
}
}