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Change the way TK_SELECT_COLUMN is handled so that the subquery is only

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generated once even if part of the vector comparison is used for indexing
and the other part is now.  This change also is a pathway to vector assignment
in UPDATE statements.

FossilOrigin-Name: d8feea7dcde83179bff303072426561cfe825e58
This commit is contained in:
drh
2016-08-20 00:07:01 +00:00
parent 8d25cb90cd
commit fc7f27b9d2
7 changed files with 106 additions and 89 deletions
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9
src/sqliteInt.h
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@@ -2298,9 +2298,11 @@ struct Expr {
int iTable; /* TK_COLUMN: cursor number of table holding column
** TK_REGISTER: register number
** TK_TRIGGER: 1 -> new, 0 -> old
** EP_Unlikely: 134217728 times likelihood */
** EP_Unlikely: 134217728 times likelihood
** TK_SELECT: 1st register of result vector */
ynVar iColumn; /* TK_COLUMN: column index. -1 for rowid.
** TK_VARIABLE: variable number (always >= 1). */
** TK_VARIABLE: variable number (always >= 1).
** TK_SELECT_COLUMN: column of the result vector */
i16 iAgg; /* Which entry in pAggInfo->aCol[] or ->aFunc[] */
i16 iRightJoinTable; /* If EP_FromJoin, the right table of the join */
u8 op2; /* TK_REGISTER: original value of Expr.op
@@ -4273,6 +4275,7 @@ int sqlite3DbstatRegister(sqlite3*);
int sqlite3ExprVectorSize(Expr *pExpr);
int sqlite3ExprIsVector(Expr *pExpr);
Expr *sqlite3ExprVectorField(Expr*, int);
Expr *sqlite3VectorFieldSubexpr(Expr*, int);
Expr *sqlite3ExprForVectorField(Parse*,Expr*,int,int);
#endif /* SQLITEINT_H */