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Convert the hint expression of the CursorHint opcode into a string for

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display by EXPLAIN.

FossilOrigin-Name: 206884718782331a7aaacc2c811e4e9d2effae91
This commit is contained in:
drh
2015-08-13 21:32:41 +00:00
parent 07194bff0e
commit f7e369070e
4 changed files with 92 additions and 12 deletions
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src/vdbeaux.c
+73 -4
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@@ -1084,9 +1084,78 @@ static int displayComment(
}
#endif /* SQLITE_DEBUG */
#if VDBE_DISPLAY_P4 && defined(SQLITE_ENABLE_CURSOR_HINTS)
/*
** Translate the P4.pExpr value for an OP_CursorHint opcode into text
** that can be displayed in the P4 column of EXPLAIN output.
*/
static int displayP4Expr(int nTemp, char *zTemp, Expr *pExpr){
const char *zBinOp = 0;
switch( pExpr->op ){
case TK_STRING:
sqlite3_snprintf(nTemp, zTemp, "%Q", pExpr->u.zToken);
break;
#if !defined(SQLITE_OMIT_EXPLAIN) || !defined(NDEBUG) \
|| defined(VDBE_PROFILE) || defined(SQLITE_DEBUG)
case TK_INTEGER:
sqlite3_snprintf(nTemp, zTemp, "%d", pExpr->u.iValue);
break;
case TK_NULL:
sqlite3_snprintf(nTemp, zTemp, "NULL");
break;
case TK_REGISTER: {
sqlite3_snprintf(nTemp, zTemp, "r[%d]", pExpr->iTable);
break;
}
case TK_COLUMN: {
sqlite3_snprintf(nTemp, zTemp, "c%d", (int)pExpr->iColumn);
break;
}
case TK_LT: zBinOp = "<"; break;
case TK_LE: zBinOp = "<="; break;
case TK_GT: zBinOp = ">"; break;
case TK_GE: zBinOp = ">="; break;
case TK_NE: zBinOp = "!="; break;
case TK_EQ: zBinOp = "=="; break;
case TK_IS: zBinOp = " IS "; break;
case TK_ISNOT: zBinOp = " IS NOT "; break;
case TK_AND: zBinOp = " AND "; break;
case TK_OR: zBinOp = " OR "; break;
case TK_PLUS: zBinOp = "+"; break;
case TK_STAR: zBinOp = "*"; break;
case TK_MINUS: zBinOp = "-"; break;
case TK_REM: zBinOp = "%"; break;
case TK_BITAND: zBinOp = "&"; break;
case TK_BITOR: zBinOp = "|"; break;
case TK_SLASH: zBinOp = "/"; break;
case TK_LSHIFT: zBinOp = "<<"; break;
case TK_RSHIFT: zBinOp = ">>"; break;
case TK_CONCAT: zBinOp = "||"; break;
default:
sqlite3_snprintf(nTemp, zTemp, "%s", "expr");
break;
}
if( zBinOp && nTemp>5 ){
int n = 1;
zTemp[0] = '(';
n += displayP4Expr(nTemp-n, zTemp+n, pExpr->pLeft);
sqlite3_snprintf(nTemp-n, zTemp+n, "%s", zBinOp);
n += sqlite3Strlen30(zTemp+n);
n += displayP4Expr(nTemp-n, zTemp+n, pExpr->pRight);
sqlite3_snprintf(nTemp-n, zTemp+n, ")");
}
return sqlite3Strlen30(zTemp);
}
#endif /* VDBE_DISPLAY_P4 && defined(SQLITE_ENABLE_CURSOR_HINTS) */
#if VDBE_DISPLAY_P4
/*
** Compute a string that describes the P4 parameter for an opcode.
** Use zTemp for any required temporary buffer space.
@@ -1127,7 +1196,7 @@ static char *displayP4(Op *pOp, char *zTemp, int nTemp){
}
#ifdef SQLITE_ENABLE_CURSOR_HINTS
case P4_EXPR: {
sqlite3_snprintf(nTemp, zTemp, "(expr)");
displayP4Expr(nTemp, zTemp, pOp->p4.pExpr);
break;
}
#endif
@@ -1206,7 +1275,7 @@ static char *displayP4(Op *pOp, char *zTemp, int nTemp){
assert( zP4!=0 );
return zP4;
}
#endif
#endif /* VDBE_DISPLAY_P4 */
/*
** Declare to the Vdbe that the BTree object at db->aDb[i] is used.