Add new functions to help.csv

h2/src/docsrc/help/help.csv

@@ -5138,6 +5138,51 @@ SELECT CUME_DIST() OVER (ORDER BY ID), * FROM TEST;
 SELECT CUME_DIST() OVER (PARTITION BY CATEGORY ORDER BY ID), * FROM TEST;
 "
 
+"Functions (Window)","FIRST_VALUE","
+FIRST_VALUE(value) [{RESPECT|IGNORE} NULLS] OVER windowSpecification
+","
+Returns the first value in a window.
+If IGNORE NULLS is specified null values are skipped and the function returns first non-null value, if any.
+
+Window functions are currently experimental in H2 and should be used with caution.
+They also may require a lot of memory for large queries.
+","
+SELECT FIRST_VALUE(X) OVER (ORDER BY ID), * FROM TEST;
+SELECT FIRST_VALUE(X) IGNORE NULLS OVER (PARTITION BY CATEGORY ORDER BY ID), * FROM TEST;
+"
+
+"Functions (Window)","LAST_VALUE","
+LAST_VALUE(value) [{RESPECT|IGNORE} NULLS] OVER windowSpecification
+","
+Returns the last value in a window.
+If IGNORE NULLS is specified null values are skipped and the function returns last non-null value before them, if any;
+if there is no non-null value it returns NULL.
+Note that the last value is actually a value in the current row.
+
+Window functions are currently experimental in H2 and should be used with caution.
+They also may require a lot of memory for large queries.
+","
+SELECT LAST_VALUE(X) OVER (ORDER BY ID), * FROM TEST;
+SELECT LAST_VALUE(X) IGNORE NULLS OVER (PARTITION BY CATEGORY ORDER BY ID), * FROM TEST;
+"
+
+"Functions (Window)","NTH_VALUE","
+NTH(value, nInt) [FROM {FIRST|LAST}] [{RESPECT|IGNORE} NULLS]
+OVER windowSpecification
+","
+Returns the value in a row with a specified relative number in a window.
+Relative row number must be positive.
+If FROM LAST is specified rows a counted backwards from the current row.
+If IGNORE NULLS is specified rows with null values in selected expression are skipped.
+If number of considered rows is less than specified relative number this function returns NULL.
+
+Window functions are currently experimental in H2 and should be used with caution.
+They also may require a lot of memory for large queries.
+","
+SELECT NTH_VALUE(X) OVER (ORDER BY ID), * FROM TEST;
+SELECT NTH_VALUE(X) IGNORE NULLS OVER (PARTITION BY CATEGORY ORDER BY ID), * FROM TEST;
+"
+
 "System Tables","Information Schema","
 INFORMATION_SCHEMA
 ","

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

@@ -796,4 +796,4 @@ interior envelopes multilinestring multipoint packed exterior normalization awkw
 xym normalizes coord setz xyzm geometrycollection multipolygon mixup rings polygons rejection finite
 pointzm pointz pointm dimensionality redefine forum measures
 mpg casted pzm mls constrained subtypes complains
-ranks rno dro rko precede cume
+ranks rno dro rko precede cume reopens