Adding JMCR-Stable version

[Benchmarks_CSolver.git] / JMCR-Stable / real-world application / MyDerby-10.3 / java / engine / org / apache / derby / catalog / Statistics.java

diff --git a/JMCR-Stable/real-world application/MyDerby-10.3/java/engine/org/apache/derby/catalog/Statistics.java b/JMCR-Stable/real-world application/MyDerby-10.3/java/engine/org/apache/derby/catalog/Statistics.java
new file mode 100644 (file)
index 0000000..26d9f16
--- /dev/null
+++ b/JMCR-Stable/real-world application/MyDerby-10.3/java/engine/org/apache/derby/catalog/Statistics.java
@@ -0,0 +1,40 @@
+/*\r
+\r
+   Derby - Class org.apache.derby.catalog.Statistics\r
+\r
+   Licensed to the Apache Software Foundation (ASF) under one or more\r
+   contributor license agreements.  See the NOTICE file distributed with\r
+   this work for additional information regarding copyright ownership.\r
+   The ASF licenses this file to You under the Apache License, Version 2.0\r
+   (the "License"); you may not use this file except in compliance with\r
+   the License.  You may obtain a copy of the License at\r
+\r
+      http://www.apache.org/licenses/LICENSE-2.0\r
+\r
+   Unless required by applicable law or agreed to in writing, software\r
+   distributed under the License is distributed on an "AS IS" BASIS,\r
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r
+   See the License for the specific language governing permissions and\r
+   limitations under the License.\r
+\r
+ */\r
+\r
+package org.apache.derby.catalog;\r
+\r
+/**\r
+ \r
+ <P>\r
+ This interface is used in the column SYS.SYSSTATISTICS.STATISTICS. It\r
+ encapsulates information collected by the UPDATE STATISTICS command\r
+ and is used internally by the Derby optimizer to estimate cost \r
+ and selectivity of different query plans.\r
+ <p>\r
+*/\r
+\r
+public interface Statistics\r
+{\r
+       /**\r
+        * @return the selectivity for a set of predicates.\r
+        */\r
+       double selectivity(Object[] predicates);\r
+}\r