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Redesigned UDF generation mechanism + Logistic Regression UDFs

Kostas FILIPPOPOLITIS requested to merge jason/dev/algo/logistic-regression into master

Created by: jassak

New UDF generation mechanism:

  • New UDF IO types annotation system allows to reference traits of input parameters in UDF return type, removing the need to completely infer the return table schema.
  • For every UDF definition code the corresponding SQL select statement is generated as well.
  • Some linear algebra operations (tensor contractions, element-wise arithmetic, ...) are coded in pure SQL.
  • A new node_id column is added at every result table creation.

Also, the complete set of UDFs needed by Logistic Regression is implemented.

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