5.2.15. Merge Sort Input

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5.2.15. Merge Sort Input

Icon: ANATEL~2_img203


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Short description:

Merge several locally sorted .gel_anatella files into one globally sorted table.


Long Description:

The input pin of the the ANATEL~2_img203 MergeSortInput Action is connected to a table that contains (many) .gel_anatella filenames. Typically, this input table will be computed using the ANATEL~2_img196 fileListFromObsDate Action (see section 5.22.5).

Anatella reads all the corresponding “Gel files” simultaneously to create a globally sorted table as output (This is more or less equivalent to the ANATEL~2_img7 Append Action but the ANATEL~2_img7 Append Action does not generate a sorted output table and takes as input tables rather than filenames).


There are some limitations: The different “Gel Files” that are merged together must:

…all have exactly the same meta-data.

…all be sorted in the same way as the globally sorted table that the ANATEL~2_img203 MergeSortInput Action creates as ouput (The sort in the output table is equal to the sort in the intput tables).


The ANATEL~2_img203 MergeSortInput is:

…a faster alternative to the simple ANATEL~2_img25 Sort Action: see sections and for more information about this subject.

…about as fast as a simple ANATEL~2_img7 Append Action: This means that the “sorting” is essentially performed “for free”. This is great!

…able to produce a sorted table of un-limited size.


The “Merge Sort” algorithm that is used to create the output table is described in section