diff options
Diffstat (limited to 'src/sqliteInt.h')
| -rw-r--r-- | src/sqliteInt.h | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/src/sqliteInt.h b/src/sqliteInt.h index 037d09e42..c123dfffb 100644 --- a/src/sqliteInt.h +++ b/src/sqliteInt.h @@ -3560,10 +3560,11 @@ struct TreeView { #endif /* SQLITE_DEBUG */ /* -** This object is used in various ways, all related to window functions +** This object is used in various ways, most (but not all) related to window +** functions. ** ** (1) A single instance of this structure is attached to the -** the Expr.pWin field for each window function in an expression tree. +** the Expr.y.pWin field for each window function in an expression tree. ** This object holds the information contained in the OVER clause, ** plus additional fields used during code generation. ** @@ -3574,6 +3575,10 @@ struct TreeView { ** (3) The terms of the WINDOW clause of a SELECT are instances of this ** object on a linked list attached to Select.pWinDefn. ** +** (4) For an aggregate function with a FILTER clause, an instance +** of this object is stored in Expr.y.pWin with eFrmType set to +** TK_FILTER. In this case the only field used is Window.pFilter. +** ** The uses (1) and (2) are really the same Window object that just happens ** to be accessible in two different ways. Use case (3) are separate objects. */ |