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Enhance the TreeView mechanism so that it shows the window function

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data structures as part of the abstract syntax tree.

FossilOrigin-Name: a2c0e1bec0d8a6f982572c4c5a8166319b8db0fe586057f7900f0ab72af6554e
This commit is contained in:
drh
2018-07-10 06:32:53 +00:00
parent 0b3b0dd1b1
commit a1fd4b520b
4 changed files with 147 additions and 19 deletions
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34
src/sqliteInt.h
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@@ -3490,8 +3490,22 @@ struct TreeView {
#endif /* SQLITE_DEBUG */
/*
** Object used to encode the OVER() clause attached to a window-function
** invocation. And some fields used while generating VM code for the same.
** This object is used in varioius ways, 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.
** This object holds the information contained in the OVER clause,
** plus additional fields used during code generation.
**
** (2) All window functions in a single SELECT form a linked-list
** attached to Select.pWin. The Window.pFunc and Window.pExpr
** fields point back to the expression that is the window function.
**
** (3) The terms of the WINDOW clause of a SELECT are instances of this
** object on a linked list attached to Select.pWinDefn.
**
** The uses (1) and (2) are really the same Window object that just happens
** to be accessible in two different ways. Use (3) is are separate objects.
*/
struct Window {
char *zName; /* Name of window (may be NULL) */
@@ -3502,20 +3516,16 @@ struct Window {
u8 eEnd; /* UNBOUNDED, CURRENT, PRECEDING or FOLLOWING */
Expr *pStart; /* Expression for "<expr> PRECEDING" */
Expr *pEnd; /* Expression for "<expr> FOLLOWING" */
Window *pNextWin; /* Next window function belonging to this SELECT */
Expr *pFilter;
FuncDef *pFunc;
Expr *pFilter; /* The FILTER expression */
FuncDef *pFunc; /* The function */
int iEphCsr; /* Temp table used by this window */
int regAccum;
int regResult;
int csrApp; /* Function cursor (used by min/max) */
int regApp; /* Function register (also used by min/max) */
int regPart;
int regPart; /* First in a set of registers holding PARTITION BY
** and ORDER BY values for the window */
Expr *pOwner; /* Expression object this window is attached to */
int nBufferCol; /* Number of columns in buffer table */
int iArgCol; /* Offset of first argument for this function */
@@ -3755,6 +3765,10 @@ char *sqlite3VMPrintf(sqlite3*,const char*, va_list);
void sqlite3TreeViewExprList(TreeView*, const ExprList*, u8, const char*);
void sqlite3TreeViewSelect(TreeView*, const Select*, u8);
void sqlite3TreeViewWith(TreeView*, const With*, u8);
#ifndef SQLITE_OMIT_WINDOWFUNC
void sqlite3TreeViewWindow(TreeView*, const Window*, u8);
void sqlite3TreeViewWinFunc(TreeView*, const Window*, u8);
#endif
#endif