[sc138209] Fix column names for Merge analyses

[Shylpx]

Resources

• Shortcut story

Context

• In https://github.com/CartoDB/camshaft/pull/355/, was added support for Merge chained analyses: _cdb_analysis_left_source/_cdb_analysis_right_source was being used as query alias. This is ok if there is only one Merge analysis, but if you add two analyses of this type to the same layer, a name conflict appears in the SQL query. To solve that, a buster was added at the end of every alias, just a numeric code generated using the current timestamp.
• This timestamp worked to allow chained analyses, but this causes the query to change every time the map is instantiated, generating cache issues, as described here. So, we need each analysis with unique alias names, but this code shouldn't change every time the map is rendered.

Changes

• Use analysis node ID as buster instead of current time.

[shortcut-integration[bot]]

This pull request has been linked to Shortcut Story #138209: [elmundodata] Click popup not showing info.