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Overview
| Comment: | Add the IS DISTINCT FROM and IS NOT DISTINCT FROM operators. |
|---|---|
| Downloads: | Tarball | ZIP archive |
| Timelines: | family | ancestors | descendants | both | is-distinct-from |
| Files: | files | file ages | folders |
| SHA1: |
0be4478209fc3544152874fde2750ce8 |
| User & Date: | drh 2015-06-13 11:48:52.517 |
Context
|
2015-06-13
| ||
| 19:05 | Added test cases based on Bruce Momjian's talk on SQL NULLs. (Leaf check-in: 68c168b5e5 user: drh tags: is-distinct-from) | |
| 11:48 | Add the IS DISTINCT FROM and IS NOT DISTINCT FROM operators. (check-in: 0be4478209 user: drh tags: is-distinct-from) | |
| 11:19 | Omit mutex calls in pcache1 when the mutex is NULL, for a significant performance improvement. (check-in: caf8f574e5 user: drh tags: trunk) | |
Changes
Changes to src/parse.y.
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pA->pRight = 0;
}
}
}
// expr1 IS expr2
// expr1 IS NOT expr2
//
// If expr2 is NULL then code as TK_ISNULL or TK_NOTNULL. If expr2
// is any other expression, code as TK_IS or TK_ISNOT.
//
expr(A) ::= expr(X) IS expr(Y). {
spanBinaryExpr(&A,pParse,TK_IS,&X,&Y);
binaryToUnaryIfNull(pParse, Y.pExpr, A.pExpr, TK_ISNULL);
}
expr(A) ::= expr(X) IS NOT expr(Y). {
spanBinaryExpr(&A,pParse,TK_ISNOT,&X,&Y);
binaryToUnaryIfNull(pParse, Y.pExpr, A.pExpr, TK_NOTNULL);
}
%include {
/* Construct an expression node for a unary prefix operator
*/
static void spanUnaryPrefix(
ExprSpan *pOut, /* Write the new expression node here */
Parse *pParse, /* Parsing context to record errors */
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pA->pRight = 0;
}
}
}
// expr1 IS expr2
// expr1 IS NOT expr2
// expr1 IS DISTINCT FROM expr2
// expr1 IS NOT DISTINCT FROM expr2
//
// If expr2 is NULL then code as TK_ISNULL or TK_NOTNULL. If expr2
// is any other expression, code as TK_IS or TK_ISNOT.
//
expr(A) ::= expr(X) IS expr(Y). {
spanBinaryExpr(&A,pParse,TK_IS,&X,&Y);
binaryToUnaryIfNull(pParse, Y.pExpr, A.pExpr, TK_ISNULL);
}
expr(A) ::= expr(X) IS NOT expr(Y). {
spanBinaryExpr(&A,pParse,TK_ISNOT,&X,&Y);
binaryToUnaryIfNull(pParse, Y.pExpr, A.pExpr, TK_NOTNULL);
}
expr(A) ::= expr(X) IS DISTINCT FROM expr(Y). {
spanBinaryExpr(&A,pParse,TK_ISNOT,&X,&Y);
binaryToUnaryIfNull(pParse, Y.pExpr, A.pExpr, TK_NOTNULL);
}
expr(A) ::= expr(X) IS NOT DISTINCT FROM expr(Y). {
spanBinaryExpr(&A,pParse,TK_IS,&X,&Y);
binaryToUnaryIfNull(pParse, Y.pExpr, A.pExpr, TK_ISNULL);
}
%include {
/* Construct an expression node for a unary prefix operator
*/
static void spanUnaryPrefix(
ExprSpan *pOut, /* Write the new expression node here */
Parse *pParse, /* Parsing context to record errors */
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