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When you run the spartandb test again, you should see all of the statements complete successfully. You should verify everything is working in the stage 4 engine and then move on to testing the index operations. The index tests will require you to have a table created and have data in it. You can always add data using the normal INSERT statements as before. Now you need to test the index. Enter a command that has a WHERE clause on the index column (col_a) like the following: SELECT * FROM t1 WHERE col_a = 2; When you run that command, you should see the row returned. That isn t very interesting, is it You ve done all that work and it just returns the row anyway. Well, the best way to know that the indexes are working is to have large data tables with a diverse range of index values. That would take a while to do, and I encourage you to do so. There s another way. You can launch the server and attach breakpoints (using your debugger) in the source code and issue the index-based queries. That may sound like lots of work and you may not have time to run but a few examples. That s fine, because you can add that functionality to the spartandb test file. You can add the key column to the CREATE and add more SELECT statements with WHERE clauses to perform point and range queries. Listing 7-55 shows the updated spartandb.test file.

You can now check that a carrySelectAdder is equivalent to a rippleAdder. Here s the overall verification condition: let checkAdders n k = let x = (vec n "x") let y = (vec n "y") let sumA = (vec n "sumA") let sumB = (vec n "sumB") let sumLo = (vec n "sumLo") let sumHi = (vec n "sumHi") let carryA = (vec (n+1) "carryA") let carryB = (vec (n+1) "carryB") let carryLo = (vec (n+1) "carryLo") let carryHi = (vec (n+1) "carryHi") let adder1 = carrySelectAdder n k x y sumLo sumHi carryLo let adder2 = rippleAdder n x y sumB carryB (adder1 &&& adder2 &&& (carryA.[0] === carryB.[0]) ==> (vecEq sumA sumB &&& bitEq carryA.[n] carryB.[n]))

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Listing 12-3 also shows the definition of some miscellaneous augmentations on the expression type, mostly related to visual layout and presentation. The StarNeeded member is used internally to determine whether the multiplication operator (the star symbol, or asterisk) is needed in the product of two expressions, e1 and e2. You may want to extend this simple rule: any product whose right side is a number requires the explicit operator, and all other cases don t. Thus, expressions such as 2(x+1) and 2x are rendered without the asterisk. The IsNumber member returns true if the expression at hand is numeric and is used in conjunction with NumOf, which returns this numeric component. Similarly, the IsNegative and Negate members determine whether you have an expression that starts with a negative sign, and they negate it on demand.

Listing 7-55. Updated Spartan Storage Engine Test File (spartandb.test) # # Simple test for the Spartan storage engine # --disable_warnings drop table if exists t1; --enable_warnings CREATE TABLE t1 ( col_a int KEY, col_b varchar(20), col_c int ) ENGINE=SPARTAN; INSERT INTO t1 VALUES (1, "first test", 24); INSERT INTO t1 VALUES (2, "second test", 43); INSERT INTO t1 VALUES (9, "fourth test", -2); INSERT INTO t1 VALUES (3, 'eighth test', -22); INSERT INTO t1 VALUES (4, "tenth test", 11); INSERT INTO t1 VALUES (8, "seventh test", 20); INSERT INTO t1 VALUES (5, "third test", 100); SELECT * FROM t1; UPDATE t1 SET col_b = "Updated!" WHERE col_a = SELECT * from t1; UPDATE t1 SET col_b = "Updated!" WHERE col_a = SELECT * from t1; UPDATE t1 SET col_b = "Updated!" WHERE col_a = SELECT * from t1; DELETE FROM t1 WHERE col_a = 1; SELECT * FROM t1; DELETE FROM t1 WHERE col_a = 3; SELECT * FROM t1; DELETE FROM t1 WHERE col_a = 5; SELECT * FROM t1; SELECT * FROM t1 WHERE col_a = 4; SELECT * FROM t1 WHERE col_a >= 2 AND col_a <= SELECT * FROM t1 WHERE col_a = 22; DELETE FROM t1 WHERE col_a = 5; SELECT * FROM t1; SELECT * FROM t1 WHERE col_a = 5; UPDATE t1 SET col_a = 99 WHERE col_a = 8; SELECT * FROM t1 WHERE col_a = 8; SELECT * FROM t1 WHERE col_a = 99; RENAME TABLE t1 TO t2; SELECT * FROM t2; DROP TABLE t2;

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