Add new requirements to getResult() methods of user-defined aggregates

h2/src/docsrc/html/changelog.html

@@ -21,6 +21,8 @@ Change Log
 
 <h2>Next Version (unreleased)</h2>
 <ul>
+<li>PR #1656: Optimize window aggregates with ORDER BY + UNBOUNDED PRECEDING + no exclusions
+</li>
 <li>Issue #1654: OOM in TestMemoryUsage, in big mode
 </li>
 <li>Issue #1651: TIMESTAMP values near DST may be changed in MVStore database due to UTC-based PageStore format in some

h2/src/main/org/h2/api/Aggregate.java

@@ -44,7 +44,9 @@ public interface Aggregate {
     void add(Object value) throws SQLException;
 
     /**
-     * This method returns the computed aggregate value.
+     * This method returns the computed aggregate value. This method must
+     * preserve previously added values and must be able to reevaluate result if
+     * more values were added since its previous invocation.
      *
      * @return the aggregated value
      */

h2/src/main/org/h2/api/AggregateFunction.java

@@ -47,7 +47,9 @@ public interface AggregateFunction {
     void add(Object value) throws SQLException;
 
     /**
-     * This method returns the computed aggregate value.
+     * This method returns the computed aggregate value. This method must
+     * preserve previously added values and must be able to reevaluate result if
+     * more values were added since its previous invocation.
      *
      * @return the aggregated value
      */

h2/src/tools/org/h2/build/doc/dictionary.txt

@@ -805,4 +805,4 @@ queryparser tokenized freeze factorings recompilation unenclosed rfe dsync
 econd irst bcef ordinality nord unnest
 analyst occupation distributive josaph aor engineer sajeewa isuru randil kevin doctor businessman artist ashan
 corrupts splitted disruption unintentional octets preconditions predicates subq objectweb insn opcodes
-preserves masking holder unboxing avert iae transformed subtle
+preserves masking holder unboxing avert iae transformed subtle reevaluate exclusions