I am strugglign with this function. My error is the following which confuses me because I thought those clauses were optional.
>[Error] Script lines: 1-6 --------------------------
[AsterData][NClusterJDBCDSII](34) ERROR: SQL-MR function HISTOGRAM_MAP failed: Please specify either the INTERVAL clause or all of the following clauses: BIN_SIZE, START_VALUE. () _
My data (p2p.wt_session_histogram) is simply 2 columns:
customer_id and cnt_sessions (integer count)
Not all those clauses are optional, they're just mutually exclusive.
The error message is correct, you have to specify either both BIN_SIZE and START_VALUE or INTERVALS.
If there was a default it might be the minimum value based on the data type (e.g. -2.147.483.648 for an INT) and a bin size of 1, you probbay don't want that :-)
Thanks, Dieter! I was able to get it to run but I was expecting to get a graphical output: literally - a histogram. Do you know if an Aster function that will generate this? Thanks, Wendy
the histogram_map/histogram_reduce combination only creates tabular output.
As Aster Lens only supports NpathViz and CFilterViz output you need a visualization tool to get graphical output.