org.apache.hadoop.hive.ql.udf.UDFMonth Maven / Gradle / Ivy
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* to you under the Apache License, Version 2.0 (the
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* http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.hadoop.hive.ql.udf;
import org.apache.hadoop.hive.common.type.Date;
import org.apache.hadoop.hive.common.type.HiveIntervalYearMonth;
import org.apache.hadoop.hive.ql.exec.Description;
import org.apache.hadoop.hive.ql.exec.UDFArgumentException;
import org.apache.hadoop.hive.ql.exec.UDFArgumentTypeException;
import org.apache.hadoop.hive.ql.exec.vector.VectorizedExpressions;
import org.apache.hadoop.hive.ql.exec.vector.expressions.VectorUDFMonthDate;
import org.apache.hadoop.hive.ql.exec.vector.expressions.VectorUDFMonthString;
import org.apache.hadoop.hive.ql.exec.vector.expressions.VectorUDFMonthTimestamp;
import org.apache.hadoop.hive.ql.metadata.HiveException;
import org.apache.hadoop.hive.ql.udf.generic.GenericUDF;
import org.apache.hadoop.hive.ql.udf.generic.NDV;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspectorConverters;
import org.apache.hadoop.hive.serde2.objectinspector.PrimitiveObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspectorFactory;
import org.apache.hadoop.io.IntWritable;
import java.util.Calendar;
import java.util.TimeZone;
/**
* UDFMonth.
*
*/
@Description(name = "month",
value = "_FUNC_(param) - Returns the month component of the date/timestamp/interval",
extended = "param can be one of:\n"
+ "1. A string in the format of 'yyyy-MM-dd HH:mm:ss' or 'yyyy-MM-dd'.\n"
+ "2. A date value\n"
+ "3. A timestamp value\n"
+ "4. A year-month interval value"
+ "Example:\n"
+ " > SELECT _FUNC_('2009-07-30') FROM src LIMIT 1;\n" + " 7")
@VectorizedExpressions({VectorUDFMonthDate.class, VectorUDFMonthString.class, VectorUDFMonthTimestamp.class})
@NDV(maxNdv = 31)
public class UDFMonth extends GenericUDF {
private transient ObjectInspectorConverters.Converter[] converters = new ObjectInspectorConverters.Converter[1];
private transient PrimitiveObjectInspector.PrimitiveCategory[] inputTypes = new PrimitiveObjectInspector.PrimitiveCategory[1];
private final IntWritable output = new IntWritable();
private final Calendar calendar = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
@Override
public ObjectInspector initialize(ObjectInspector[] arguments) throws UDFArgumentException {
checkArgsSize(arguments, 1, 1);
checkArgPrimitive(arguments, 0);
switch (((PrimitiveObjectInspector) arguments[0]).getPrimitiveCategory()) {
case INTERVAL_YEAR_MONTH:
inputTypes[0] = PrimitiveObjectInspector.PrimitiveCategory.INTERVAL_YEAR_MONTH;
converters[0] = ObjectInspectorConverters.getConverter(
arguments[0], PrimitiveObjectInspectorFactory.writableHiveIntervalYearMonthObjectInspector);
break;
case STRING:
case CHAR:
case VARCHAR:
case DATE:
case TIMESTAMP:
case TIMESTAMPLOCALTZ:
case VOID:
obtainDateConverter(arguments, 0, inputTypes, converters);
break;
default:
// build error message
StringBuilder sb = new StringBuilder();
sb.append(getFuncName());
sb.append(" does not take ");
sb.append(((PrimitiveObjectInspector) arguments[0]).getPrimitiveCategory());
sb.append(" type");
throw new UDFArgumentTypeException(0, sb.toString());
}
ObjectInspector outputOI = PrimitiveObjectInspectorFactory.writableIntObjectInspector;
return outputOI;
}
@Override
public Object evaluate(DeferredObject[] arguments) throws HiveException {
switch (inputTypes[0]) {
case INTERVAL_YEAR_MONTH:
HiveIntervalYearMonth intervalYearMonth = getIntervalYearMonthValue(arguments, 0, inputTypes, converters);
if (intervalYearMonth == null) {
return null;
}
output.set(intervalYearMonth.getMonths());
break;
case STRING:
case CHAR:
case VARCHAR:
case DATE:
case TIMESTAMP:
case TIMESTAMPLOCALTZ:
case VOID:
Date date = getDateValue(arguments, 0, inputTypes, converters);
if (date == null) {
return null;
}
calendar.setTimeInMillis(date.toEpochMilli());
output.set(1 + calendar.get(Calendar.MONTH));
}
return output;
}
@Override
protected String getFuncName() {
return "month";
}
@Override
public String getDisplayString(String[] children) {
return getStandardDisplayString(getFuncName(), children);
}
}