package com.esri.hadoop.hive;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hive.ql.exec.Description;
import org.apache.hadoop.io.BytesWritable;
// DoubleWritable - must use hive-serde2; the other one produces struct {value:d.d}
import org.apache.hadoop.hive.serde2.io.DoubleWritable;
import com.esri.core.geometry.Envelope;
import com.esri.core.geometry.ogc.OGCGeometry;
@Description(name = "ST_MinY",
value = "_FUNC_(geometry) - returns the minimum Y coordinate of geometry",
extended = "Example:\n"
+ " > SELECT _FUNC_(ST_Point(1.5, 2.5)) FROM src LIMIT 1; -- 2.5\n"
+ " > SELECT _FUNC_(ST_LineString(1.5,2.5, 3.0,2.2)) FROM src LIMIT 1; -- 2.2\n"
)
//@HivePdkUnitTests(
// cases = {
// @HivePdkUnitTest(
// query = "select ST_MinY(ST_Point(1,2)) from onerow",
// result = "2"
// ),
// @HivePdkUnitTest(
// query = "select ST_MinY(ST_LineString(1.5,2.5, 3.0,2.2)) from onerow",
// result = "2.2"
// ),
// @HivePdkUnitTest(
// query = "select ST_MinY(ST_Polygon(1,1, 1,4, 4,4, 4,1)) from onerow",
// result = "1"
// ),
// @HivePdkUnitTest(
// query = "select ST_MinY(ST_MultiPoint(0,0, 2,2)) from onerow",
// result = "0"
// ),
// @HivePdkUnitTest(
// query = "select ST_MinY(ST_MultiLineString(array(1, 1, 2, 2), array(10, 10, 20, 20))) from onerow",
// result = "1"
// ),
// @HivePdkUnitTest(
// query = "select ST_MinY(ST_MultiPolygon(array(1,1, 1,2, 2,2, 2,1), array(3,3, 3,4, 4,4, 4,3))) from onerow",
// result = "1"
// ),
// @HivePdkUnitTest(
// query = "select ST_MinY(null) from onerow",
// result = "null"
// )
// }
//)
public class ST_MinY extends ST_GeometryAccessor {
final DoubleWritable resultDouble = new DoubleWritable();
static final Log LOG = LogFactory.getLog(ST_MinY.class.getName());
public DoubleWritable evaluate(BytesWritable geomref) {
if (geomref == null || geomref.getLength() == 0) {
LogUtils.Log_ArgumentsNull(LOG);
return null;
}
OGCGeometry ogcGeometry = GeometryUtils.geometryFromEsriShape(geomref);
if (ogcGeometry == null) {
LogUtils.Log_ArgumentsNull(LOG);
return null;
}
Envelope envBound = new Envelope();
ogcGeometry.getEsriGeometry().queryEnvelope(envBound);
resultDouble.set(envBound.getYMin());
return resultDouble;
}
}