unifiedExpr
Syntax
unifiedExpr(objs, optrs)
Arguments
objs is a tuple with no less than 2 elements.
optrs is a vector of binary operators and the length is size(objs)-1.
Details
Connect the operands in objs with the binary operators in optrs to generate metacode of a multivariate expression. You can execute the metacode with function eval.
Examples
$ unifiedExpr((1, 2), add)
<1 + 2>
$ t=table(1..3 as price1, 4..6 as price2, 5..7 as price3)
$ a=sqlColAlias(unifiedExpr((sqlCol("price1"), sqlCol("price2"), sqlCol("price3")), take(add, 2)))
$ sql(select=(sqlCol(`price1),sqlCol(`price2),sqlCol(`price3),a), from=t).eval()
price1 |
price2 |
price3 |
price1_add |
|---|---|---|---|
1 |
4 |
5 |
10 |
2 |
5 |
6 |
13 |
3 |
6 |
7 |
16 |
Related function: binaryExpr