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A better comment on the generated code for the NULL-in-RHS-of-IN detection

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logic.

FossilOrigin-Name: 9bc1c730a366e75b760b58e7a343d39165b2a469
This commit is contained in:
drh
2014-08-01 21:12:35 +00:00
parent 6be515ebe0
commit 4c259e9f40
3 changed files with 10 additions and 10 deletions
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6
src/expr.c
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@@ -1476,8 +1476,8 @@ int sqlite3CodeOnce(Parse *pParse){
}
/*
** Generate code that checks the single-column index table iCur to see if
** contains any NULL entries. Cause the register at regHasNull to be set
** Generate code that checks the left-most column of index table iCur to see if
** it contains any NULL entries. Cause the register at regHasNull to be set
** to a non-NULL value if iCur contains no NULLs. Cause register regHasNull
** to be set to NULL if iCur contains one or more NULL values.
*/
@@ -1487,7 +1487,7 @@ static void sqlite3SetHasNullFlag(Vdbe *v, int iCur, int regHasNull){
j1 = sqlite3VdbeAddOp1(v, OP_Rewind, iCur); VdbeCoverage(v);
sqlite3VdbeAddOp3(v, OP_Column, iCur, 0, regHasNull);
sqlite3VdbeChangeP5(v, OPFLAG_TYPEOFARG);
VdbeComment((v, "<maybe-NULL?>"));
VdbeComment((v, "first_entry_in(%d)", iCur));
sqlite3VdbeJumpHere(v, j1);
}