exosql v0.2.55 ExoSQL.Expr View Source

Expression executor.

Requires a simplified expression from ExoSQL.Expr.simplify that converts columns names to column positions, and then use as:

iex> context = %{ row: [1,2,3,4,5] }
  iex> expr = {:op, {"*", {:column, 1}, {:column, 2}}}
  iex> ExoSQL.Expr.run_expr(expr, context)
  6

Link to this section Summary

Functions

Try to return matching types

Simplify the column ids to positions on the list of columns, to ease operations

Link to this section Functions

Try to return matching types.

  • If any is datetime, return datetimes
  • If any is number, return numbers
  • Otherwise, as is

Simplify the column ids to positions on the list of columns, to ease operations.

This operation is required to change expressions from column names to column positions, so that ExoSQL.Expr can perform its operations on rows.