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Improvements to the description of the OPFLAG_TYPEOFARG option to OP_Column.

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FossilOrigin-Name: 5e9c67ba18b701aabbb0546acdfc532c9e8f0d27fb0a2c899415a5c47096c90b
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drh
2022-10-13 14:54:32 +00:00
parent bd1c634546
commit eddfa9840e
3 changed files with 13 additions and 11 deletions
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@@ -1,5 +1,5 @@
C Adjust\sthe\simplementation\sof\ssqlite3VdbeTypeofColumn()\sto\smake\sit\seasier\nto\stest\s(and\sslightly\ssmaller).
D 2022-10-13T14:35:20.191
C Improvements\sto\sthe\sdescription\sof\sthe\sOPFLAG_TYPEOFARG\soption\sto\sOP_Column.
D 2022-10-13T14:54:32.397
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79fdd021df256c6a2b9973fd6bf8e52ffaaf4d369d40489b8395ac97880b1325
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@@ -2781,10 +2781,12 @@ case OP_Offset: { /* out3 */
** if the P4 argument is a P4_MEM use the value of the P4 argument as
** the result.
**
** If the OPFLAG_LENGTHARG and OPFLAG_TYPEOFARG bits are set on P5 then
** the result is guaranteed to only be used as the argument of a length()
** or typeof() function, respectively. The loading of large blobs can be
** skipped for length() and all content loading can be skipped for typeof().
** If the OPFLAG_LENGTHARG bit is set in P5 then the result is guaranteed
** to only be used by the length() function or the equivalent. The content
** of large blobs is not loaded, thus saving CPU cycles. If the
** OPFLAG_TYPEOFARG bit is set then the result will only be used by the
** typeof() function or the IS NULL or IS NOT NULL operators or the
** equivalent. In this case, all content loading can be omitted.
*/
case OP_Column: {
u32 p2; /* column number to retrieve */