Method: Sequel::Dataset#function_sql_append

Defined in:
lib/sequel/dataset/sql.rb

#function_sql_append(sql, f) ⇒ Object

Append literalization of function call to SQL string.


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# File 'lib/sequel/dataset/sql.rb', line 488

def function_sql_append(sql, f)
  name = f.name
  opts = f.opts

  if opts[:emulate]
    if emulate_function?(name)
      emulate_function_sql_append(sql, f)
      return
    end

    name = native_function_name(name) 
  end

  sql << 'LATERAL ' if opts[:lateral]

  case name
  when SQL::Identifier
    if supports_quoted_function_names? && opts[:quoted]
      literal_append(sql, name)
    else
      sql << name.value.to_s
    end
  when SQL::QualifiedIdentifier
    if supports_quoted_function_names? && opts[:quoted] != false
      literal_append(sql, name)
    else
      sql << split_qualifiers(name).join('.')
    end
  else
    if supports_quoted_function_names? && opts[:quoted]
      quote_identifier_append(sql, name)
    else
      sql << name.to_s
    end
  end

  sql << '('
  if filter = opts[:filter]
    filter = filter_expr(filter, &opts[:filter_block])
  end
  if opts[:*]
    if filter && !supports_filtered_aggregates?
      literal_append(sql, Sequel.case({filter=>1}, nil))
      filter = nil
    else
      sql <<  '*'
    end
  else
    sql << "DISTINCT " if opts[:distinct]
    if filter && !supports_filtered_aggregates?
      expression_list_append(sql, f.args.map{|arg| Sequel.case({filter=>arg}, nil)})
      filter = nil
    else
      expression_list_append(sql, f.args)
    end
    if order = opts[:order]
      sql << " ORDER BY "
      expression_list_append(sql, order)
    end
  end
  sql << ')'

  if group = opts[:within_group]
    sql << " WITHIN GROUP (ORDER BY "
    expression_list_append(sql, group)
    sql << ')'
  end

  if filter
    sql << " FILTER (WHERE "
    literal_append(sql, filter)
    sql << ')'
  end

  if window = opts[:over]
    sql << ' OVER '
    window_sql_append(sql, window.opts)
  end

  if opts[:with_ordinality]
    sql << " WITH ORDINALITY"
  end
end