libaquery: optimizations that reduces vector copy.

tests/funcs.a

@@ -22,4 +22,4 @@ FIELDS TERMINATED BY ","
 SELECT pairCorr(c, b) * d, sum(a), b
 FROM test1
 group by c,b,d
-order by b ASC
+order by b ASC

tests/joins.a

@@ -24,11 +24,11 @@ LOAD DATA INFILE "data/test.csv"
 INTO TABLE tt
 FIELDS TERMINATED BY ","
 
-CREATE TABLE sale(Mont INT, sales INT)
+CREATE TABLE sale1(Mont INT, sales INT)
 
 LOAD DATA INFILE "data/moving_avg.csv"
-INTO TABLE sale
+INTO TABLE sale1
 FIELDS TERMINATED BY ","
 
-select sd(a) + sales from tt, sale where tt.a = sale.Mont
+select sd(a) + sales from tt, sale1 where tt.a = sale1.Mont
 

tests/udf3.a

@@ -1,6 +1,6 @@
 
 
-AGGREGATION FUNCTION covariances2(x, y, w){
+AGGREGATION FUNCTION covariances2(x, y, win){
     xmeans := 0.;
     ymeans := 0.;
     l := _builtin_len;
@@ -11,6 +11,7 @@ AGGREGATION FUNCTION covariances2(x, y, w){
         ymeans := y[0];
         _builtin_ret[0] := 0.;
     }
+    w := win;
     if (w > l)
         w := l;
     for (i := 1, j:= 0; i < w; i := i+1) {