exosql v0.2.88 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)
6Link to this section Summary
Functions
Unifies equal comparison
Unifies is greater comparison
Unifies greater or equal comparison
Try to return matching types
Simplify the column ids to positions on the list of columns, to ease operations
Link to this section Functions
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is_equal(r1, r2) View Source
Unifies equal comparison
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is_greater(r1, r2) View Source
Unifies is greater comparison
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is_greater_or_equal(r1, r2) View Source
Unifies greater or equal comparison
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like(str, str) View Source
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match_types(a, b) View Source
Try to return matching types.
- If any is datetime, return datetimes
- If any is number, return numbers
- Otherwise, as is
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run_expr(arg, context) View Source
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simplify(list, context) View Source
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.