Bitwise left shift (lshift, <<)

[ 1 Description ] [ 2 How does it work in the search window? ] [ 3 How does it work in LINQ? ]

Description

Creates a new column that shifts to the left the bits of the values in the first argument as many positions as specified in the second argument. The result is then transformed and given in decimal format.

This operation uses an 8-bit register. The bits that are shifted out are discarded, and the bit positions that have been vacated by the shift operation are zero-filled.

The following example shows how the bits in the binary form of the value 23 (00010111) are shifted to the left 2 positions. The two first values (in red) are discarded, and the vacant positions are filled with zeros (in green). The result is 01011100, which corresponds to the decimal number 92.

For more information about bitwise shifts, see this article.

How does it work in the search window?

Select Create column in the search window toolbar, then select the Bitwise left shift operation. You need to specify two arguments:

Argument	Data type	More information

Argument	Data type	More information
Number ^mandatory	integer	Field whose values you want to transform.
Number ^mandatory	integer	Number of places to shift to the left.

The data type of the values in the new column is integer.

Example

The examples in this article use values in a data table generated by the following CSV file.

If you want to try the example for yourself, download the file and upload it to your domain clicking Data upload in the navigation pane. Name the new table my.upload.sample.data and select Current date as Date parsing type. Learn more about uploading data in Uploading log files.

After receiving the confirmation message, you can access the table from the Finder, selecting my → upload → sample → data. When you upload data from a file, all the information is included in a single column called message. TTo split the values and extract those we need for this operation into a new column, you can use the Split operation. Click Toggle Query Editor in the search window toolbar and paste the following LINQ query to save time:

from my.upload.sample.data
select split(message, ";", 17) as posNumbers1
select int(posNumbers1) as posNumbers1_int

We want to shift 2 positions to the left the bits of the values in the posNumbers1_int column. To do it, we will create a new column using the Bitwise left shift operation. Let's call the new column lshift_2

The arguments needed to create the new column are:

Number - posNumbers1_int column
Number - Click the pencil icon and enter 2

Click Create column and you will see the following result:

How does it work in LINQ?

Use the operator select... as... and add the operation syntax to create the new column. These are the valid formats of the Bitwise left shift operation:

lshift(integer1, integer2)
integer1 << integer2

Example

You can copy the following LINQ scripts and try the above example on the my.upload.sample.data table.

from my.upload.sample.data
select split(message, ";", 17) as posNumbers1
select int(posNumbers1) as posNumbers1_int
  select lshift(posNumbers1_int, 2) as lshift_2

or

from my.upload.sample.data
select split(message, ";", 17) as posNumbers1
select int(posNumbers1) as posNumbers1_int
  select posNumbers1_int << 2 as lshift_2