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Add support for attaching a FILTER clause to an aggregate function.

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FossilOrigin-Name: ee293e5aeac0b05a8b809095610fd8b4fdaf8e68cd368de90ec0d45e3582ffe5
This commit is contained in:
dan
2019-07-13 16:39:38 +00:00
parent 8616cff6c8 4f9adee289
commit df9d32441a
17 changed files with 580 additions and 104 deletions
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21
src/sqliteInt.h
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@@ -2491,7 +2491,7 @@ struct Expr {
union {
Table *pTab; /* TK_COLUMN: Table containing column. Can be NULL
** for a column of an index on an expression */
Window *pWin; /* TK_FUNCTION: Window definition for the func */
Window *pWin; /* EP_WinFunc: Window/Filter defn for a function */
struct { /* TK_IN, TK_SELECT, and TK_EXISTS */
int iAddr; /* Subroutine entry address */
int regReturn; /* Register used to hold return address */
@@ -2579,6 +2579,14 @@ struct Expr {
*/
#define EXPRDUP_REDUCE 0x0001 /* Used reduced-size Expr nodes */
/*
** True if the expression passed as an argument was a function with
** an OVER() clause (a window function).
*/
#define IsWindowFunc(p) ( \
ExprHasProperty((p), EP_WinFunc) && p->y.pWin->eFrmType!=TK_FILTER \
)
/*
** A list of expressions. Each expression may optionally have a
** name. An expr/name combination can be used in several ways, such
@@ -3552,10 +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.
**
@@ -3566,6 +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.
*/
@@ -3603,7 +3616,7 @@ void sqlite3WindowDelete(sqlite3*, Window*);
void sqlite3WindowListDelete(sqlite3 *db, Window *p);
Window *sqlite3WindowAlloc(Parse*, int, int, Expr*, int , Expr*, u8);
void sqlite3WindowAttach(Parse*, Expr*, Window*);
int sqlite3WindowCompare(Parse*, Window*, Window*);
int sqlite3WindowCompare(Parse*, Window*, Window*, int);
void sqlite3WindowCodeInit(Parse*, Window*);
void sqlite3WindowCodeStep(Parse*, Select*, WhereInfo*, int, int);
int sqlite3WindowRewrite(Parse*, Select*);