Class: Arel::Visitors::MySQL

Inherits:
Object
  • Object
show all
Defined in:
lib/arel_extensions/visitors/mysql.rb

Constant Summary collapse

DATE_MAPPING = 
{
  'd' => 'DAY', 'm' => 'MONTH', 'w' => 'WEEK', 'y' => 'YEAR', 'wd' => 'WEEKDAY',
  'h' => 'HOUR', 'mn' => 'MINUTE', 's' => 'SECOND'
}.freeze
DATE_FORMAT_DIRECTIVES =

ISO C / POSIX

{ # ISO C / POSIX
  '%Y' => '%Y', '%C' =>   '', '%y' => '%y', '%m' => '%m', '%B' => '%M', '%b' => '%b', '%^b' => '%b',  # year, month
  '%V' => '%v', '%G' => '%x',                                                                         # ISO week number and year of week
  '%d' => '%d', '%e' => '%e', '%j' => '%j', '%w' => '%w', '%a' => '%a', '%A' => '%W',                 # day, weekday
  '%H' => '%H', '%k' => '%k', '%I' => '%I', '%l' => '%l', '%P' => '%p', '%p' => '%p',                 # hours
  '%M' => '%i', '%S' => '%S', '%L' =>   '', '%N' => '%f', '%z' => ''
}.freeze

Instance Method Summary collapse

Instance Method Details

#collect_nodes_for(nodes, collector, spacer, connector = ", ") ⇒ Object 



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# File 'lib/arel_extensions/visitors/mysql.rb', line 19

def collect_nodes_for(nodes, collector, spacer, connector = ", ")
  if nodes&.any?
    collector << spacer
    inject_join nodes, collector, connector
  end
end

#json_supported? ⇒ Boolean

JSON if implemented only after 10.2.3 (aggregations after 10.5.0) in MariaDb and 5.7 (aggregations after 5.7.22) in MySql

Returns:

  • (Boolean) 


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# File 'lib/arel_extensions/visitors/mysql.rb', line 535

def json_supported?
  version_supported?('10.5.0', '5.7.22')
end

#regexp_replace_supported? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/arel_extensions/visitors/mysql.rb', line 543

def regexp_replace_supported?
  version_supported?('10.0.5', '8.0')
end

#version_supported?(mariadb_v = '10.2.3', mysql_v = '5.7.0') ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/arel_extensions/visitors/mysql.rb', line 547

def version_supported?(mariadb_v = '10.2.3', mysql_v = '5.7.0')
  conn = Arel::Table.engine.connection
  conn.send(:mariadb?) && \
    (conn.respond_to?(:get_database_version) && conn.send(:get_database_version) >= mariadb_v || \
    conn.respond_to?(:version) && conn.send(:version) >= mariadb_v || \
    conn.instance_variable_get(:"@version") && conn.instance_variable_get(:"@version") >= mariadb_v) || \
    !conn.send(:mariadb?) && \
      (conn.respond_to?(:get_database_version) && conn.send(:get_database_version) >= mysql_v || \
      conn.respond_to?(:version) && conn.send(:version) >= mysql_v || \
      conn.instance_variable_get(:"@version") && conn.instance_variable_get(:"@version") >= mysql_v)
  # ideally we should parse the instance_variable @full_version because @version contains only the supposedly
  # corresponding mysql version of the current mariadb version (which is not very helpful most of the time)
end

#visit_Aggregate_For_AggregateFunction(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/mysql.rb', line 495

def visit_Aggregate_For_AggregateFunction o, collector
  if !window_supported?
    warn('Warning: ArelExtensions: Window Functions are not available in the current version of the DBMS.')
    return collector
  end

  if !o.order.empty? || !o.group.empty?
    collector << ' OVER ('
    if !o.group.empty?
      collector << ' PARTITION BY ('
      visit o.group, collector
      collector << ')'
    end
    if !o.order.empty?
      collector << ' ORDER BY ('
      visit o.order, collector
      collector << ')'
    end
    collector << ')'
  end
  collector
end

#visit_Arel_Nodes_As(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/mysql.rb', line 425

def visit_Arel_Nodes_As o, collector
  if o.left.is_a?(Arel::Nodes::Binary)
    collector << '('
    collector = visit o.left, collector
    collector << ')'
  else
    collector = visit o.left, collector
  end
  collector << ' AS '

  # sometimes these values are already quoted, if they are, don't double quote it
  quote = o.right.is_a?(Arel::Nodes::SqlLiteral) && o.right[0] != '`' && o.right[-1] != '`'

  collector << '`' if quote
  collector = visit o.right, collector
  collector << '`' if quote

  collector
end

#visit_Arel_Nodes_RollUp(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/mysql.rb', line 187

def visit_Arel_Nodes_RollUp(o, collector)
  visit o.expr, collector
  collector << " WITH ROLLUP"
end

#visit_Arel_Nodes_SelectCore(o, collector) ⇒ Object

The whole purpose of this override is to fix the behavior of RollUp. All other databases treat RollUp sanely, execpt MySQL which requires that it figures as the last element of a GROUP BY.



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# File 'lib/arel_extensions/visitors/mysql.rb', line 30

def visit_Arel_Nodes_SelectCore(o, collector)
  collector << "SELECT"

  collector = collect_optimizer_hints(o, collector) if self.respond_to?(:collect_optimizer_hinsts)
  collector = maybe_visit o.set_quantifier, collector

  collect_nodes_for o.projections, collector, " "

  if o.source && !o.source.empty?
    collector << " FROM "
    collector = visit o.source, collector
  end

  # The actual work
  groups = o.groups
  rollup = groups.select { |g| g.expr.class == Arel::Nodes::RollUp }.map { |r| r.expr.value }
  if rollup && !rollup.empty?
    groups = o.groups.reject { |g| g.expr.class == Arel::Nodes::RollUp }
    groups << Arel::Nodes::RollUp.new(rollup)
  end
  # FIN

  collect_nodes_for o.wheres, collector, " WHERE ", " AND "
  collect_nodes_for groups, collector, " GROUP BY "            # Look ma, I'm viring a group
  collect_nodes_for o.havings, collector, " HAVING ", " AND "
  collect_nodes_for o.windows, collector, " WINDOW "

  if o.respond_to?(:comment)
    maybe_visit o.comment, collector 
  else
    collector
  end
end

#visit_Arel_Nodes_SelectStatement(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/mysql.rb', line 416

def visit_Arel_Nodes_SelectStatement o, collector
  if !(collector.value.blank? || (collector.value.is_a?(Array) && collector.value[0].blank?)) && o.limit.blank? && o.offset.blank?
    o = o.dup
    o.orders = []
  end
  old_visit_Arel_Nodes_SelectStatement(o, collector)
end

#visit_ArelExtensions_Nodes_AiIMatches(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/mysql.rb', line 110

def visit_ArelExtensions_Nodes_AiIMatches o, collector
  collector = visit o.left.ai_collate, collector
  collector << ' LIKE '
  collector = visit o.right.ai_collate, collector
  if o.escape
    collector << ' ESCAPE '
    collector = visit o.escape, collector
  end
  collector
end

#visit_ArelExtensions_Nodes_AiMatches(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/mysql.rb', line 99

def visit_ArelExtensions_Nodes_AiMatches o, collector
  collector = visit o.left.ai_collate, collector
  collector << ' LIKE '
  collector = visit o.right.ai_collate, collector
  if o.escape
    collector << ' ESCAPE '
    collector = visit o.escape, collector
  end
  collector
end

#visit_ArelExtensions_Nodes_Cast(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/mysql.rb', line 394

def visit_ArelExtensions_Nodes_Cast o, collector
  as_attr =
    case o.as_attr
    when :binary           then 'binary'
    when :date             then 'date'
    when :datetime         then 'datetime'
    when :int              then 'signed'
    when :number, :decimal then 'decimal(20,6)'
    when :string           then 'char'
    when :time             then 'time'
    else                        o.as_attr.to_s
    end

  collector << 'CAST('
  collector = visit o.left, collector
  collector << ' AS '
  collector = visit Arel::Nodes::SqlLiteral.new(as_attr), collector
  collector << ')'
  collector
end

#visit_ArelExtensions_Nodes_Collate(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/mysql.rb', line 145

def visit_ArelExtensions_Nodes_Collate o, collector
  charset =
    case o.expressions.first
    when Arel::Attributes::Attribute
      case o.option
      when 'latin1', 'utf8'
        o.option
      else
        Arel::Table.engine.connection.charset || 'utf8'
      end
    else
      (o.option == 'latin1') ? 'latin1' : 'utf8'
    end
  collector = visit o.expressions.first, collector
  collector <<
    if o.ai
      " COLLATE #{charset == 'latin1' ? 'latin1_general_ci' : 'utf8_unicode_ci'}"
    # doesn't work in latin1
    elsif o.ci
      " COLLATE #{charset == 'latin1' ? 'latin1_general_ci' : 'utf8_unicode_ci'}"
    else
      " COLLATE #{charset}_bin"
    end
  collector
end

#visit_ArelExtensions_Nodes_Concat(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/mysql.rb', line 171

def visit_ArelExtensions_Nodes_Concat o, collector
  collector << 'CONCAT('
  o.expressions.each_with_index { |arg, i|
    collector << COMMA if i != 0
    if arg.is_a?(Numeric) || arg.is_a?(Arel::Attributes::Attribute)
      collector << 'CAST('
      collector = visit arg, collector
      collector << ' AS char)'
    else
      collector = visit arg, collector
    end
  }
  collector << ')'
  collector
end

#visit_ArelExtensions_Nodes_DateAdd(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/mysql.rb', line 338

def visit_ArelExtensions_Nodes_DateAdd o, collector
  collector << 'DATE_ADD('
  collector = visit o.left, collector
  collector << COMMA
  collector = visit o.mysql_value(o.right), collector
  collector << ')'
  collector
end

#visit_ArelExtensions_Nodes_DateDiff(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/mysql.rb', line 308

def visit_ArelExtensions_Nodes_DateDiff o, collector
  case o.right_node_type
  when :ruby_date, :ruby_time, :date, :datetime, :time
    collector <<
      case o.left_node_type
      when :ruby_time, :datetime, :time then 'TIMESTAMPDIFF(SECOND, '
      else                                   'DATEDIFF('
      end
    collector = visit o.right, collector
    collector << COMMA
    collector = visit o.left, collector
    collector << ')'
  else
    collector << '('
    collector = visit o.left, collector
    collector << ' - '
    if o.right.is_a?(ArelExtensions::Nodes::Duration)
      o.right.with_interval = true
      collector = visit o.right, collector
    else
      collector << '('
      collector = visit o.right, collector
      collector << ')'
    end
    collector << ')'
    collector
  end
  collector
end

#visit_ArelExtensions_Nodes_Duration(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/mysql.rb', line 347

def visit_ArelExtensions_Nodes_Duration o, collector
  if o.left == 'wd'
    collector << '(WEEKDAY('
    collector = visit o.right, collector
    collector << ') + 1) % 7'
  else
    if o.with_interval
      interval =
        case o.left
        when 'd', 'm', 'y'
          'DAY'
        when 'h', 'mn', 's'
          'SECOND'
        when /i\z/
          DATE_MAPPING[o.left[0..-2]]
        end
    end
    collector << ' INTERVAL ' if o.with_interval && interval
    collector << "#{DATE_MAPPING[o.left]}("
    collector = visit o.right, collector
    collector << ')'
    collector << " #{interval} " if o.with_interval && interval
  end
  collector
end

#visit_ArelExtensions_Nodes_Format(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/mysql.rb', line 254

def visit_ArelExtensions_Nodes_Format o, collector
  # One use case we met is
  # `case…when…then(valid_date).else(Arel.null).format(…)`.
  #
  # In this case, `o.col_type` is `nil` but we have a legitimate type in
  # the expression to be formatted.  The following is a best effort to
  # infer the proper type.
  first = o.expressions[0]
  type =
    o.col_type.nil? \
      && (first.respond_to?(:return_type) && !first&.return_type.nil?) \
    ? first&.return_type \
    : o.col_type

  case type
  when :date, :datetime, :time
    visit_ArelExtensions_Nodes_FormattedDate o, collector
  when :integer, :float, :decimal
    collector << 'FORMAT('
    collector = visit o.left, collector
    collector << Arel::Visitors::ToSql::COMMA
    collector << '2'
    collector << Arel::Visitors::ToSql::COMMA
    collector = visit o.right, collector
    collector << ')'
  else
    collector = visit o.left, collector
  end
  collector
end

#visit_ArelExtensions_Nodes_FormattedDate(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/mysql.rb', line 285

def visit_ArelExtensions_Nodes_FormattedDate o, collector
  fmt = ArelExtensions::Visitors::strftime_to_format(o.iso_format, DATE_FORMAT_DIRECTIVES)
  collector << 'DATE_FORMAT('
  collector << 'CONVERT_TZ(' if o.time_zone
  collector = visit o.left, collector
  case o.time_zone
  when Hash
    src_tz, dst_tz = o.time_zone.first
    collector << COMMA
    collector = visit Arel.quoted(src_tz), collector
    collector << COMMA
    collector = visit Arel.quoted(dst_tz), collector
    collector << ')'
  when String
    collector << COMMA << "'UTC'" << COMMA
    collector = visit Arel.quoted(o.time_zone), collector
    collector << ')'
  end
  collector << COMMA
  collector = visit Arel.quoted(fmt), collector
  collector << ')'
end

#visit_ArelExtensions_Nodes_FormattedNumber(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/mysql.rb', line 445

def visit_ArelExtensions_Nodes_FormattedNumber o, collector
  col = o.left.coalesce(0)
  params = o.locale ? [o.precision, Arel.quoted(o.locale)] : [o.precision]
  sign = Arel.when(col < 0).
            then('-').
            else(o.flags.include?('+') ? '+' : (o.flags.include?(' ') ? ' ' : ''))
  sign_length = ArelExtensions::Nodes::Length.new([sign])

  number =
    if o.scientific_notation
      ArelExtensions::Nodes::Concat.new([
              Arel::Nodes::NamedFunction.new('FORMAT', [
                col.abs / Arel.quoted(10).pow(col.abs.log10.floor)
              ] + params),
              o.type,
              Arel::Nodes::NamedFunction.new('FORMAT', [
                col.abs.log10.floor,
                0
              ])
            ])
    else
      Arel::Nodes::NamedFunction.new('FORMAT', [col.abs] + params)
    end

  repeated_char =
    if o.width == 0
      Arel.quoted('')
    else
      Arel
        .when(Arel.quoted(o.width).abs - (number.length + sign_length) > 0)
        .then(Arel.quoted(
                o.flags.include?('-') ? ' ' : (o.flags.include?('0') ? '0' : ' ')
              ).repeat(Arel.quoted(o.width).abs - (number.length + sign_length))
             )
        .else('')
    end
  before = !o.flags.include?('0') && !o.flags.include?('-') ? repeated_char : ''
  middle = o.flags.include?('0') && !o.flags.include?('-')  ? repeated_char : ''
  after  = o.flags.include?('-') ? repeated_char : ''
  full_number = ArelExtensions::Nodes::Concat.new([
      before,
      sign,
      middle,
      number,
      after
    ])
  collector = visit ArelExtensions::Nodes::Concat.new([Arel.quoted(o.prefix), full_number, Arel.quoted(o.suffix)]), collector
  collector
end

#visit_ArelExtensions_Nodes_GroupConcat(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/mysql.rb', line 192

def visit_ArelExtensions_Nodes_GroupConcat o, collector
  collector << 'GROUP_CONCAT('
  collector = visit o.left, collector
  if !o.order.blank?
    collector << ' ORDER BY '
    o.order.each_with_index do |order, i|
      collector << Arel::Visitors::ToSql::COMMA if i != 0
      collector = visit order, collector
    end
  end
  if o.separator && o.separator != 'NULL'
    collector << ' SEPARATOR '
    collector = visit o.separator, collector
  end
  collector << ')'
  collector
end

#visit_ArelExtensions_Nodes_IDoesNotMatch(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/mysql.rb', line 132

def visit_ArelExtensions_Nodes_IDoesNotMatch o, collector
  collector << 'LOWER('
  collector = visit o.left, collector
  collector << ') NOT LIKE LOWER('
  collector = visit o.right, collector
  collector << ')'
  if o.escape
    collector << ' ESCAPE '
    collector = visit o.escape, collector
  end
  collector
end

#visit_ArelExtensions_Nodes_IMatches(o, collector) ⇒ Object

String functions



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# File 'lib/arel_extensions/visitors/mysql.rb', line 86

def visit_ArelExtensions_Nodes_IMatches o, collector # insensitive on ASCII
  collector << 'LOWER('
  collector = visit o.left, collector
  collector << ') LIKE LOWER('
  collector = visit o.right, collector
  collector << ')'
  if o.escape
    collector << ' ESCAPE '
    collector = visit o.escape, collector
  end
  collector
end

#visit_ArelExtensions_Nodes_IsNotNull(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/mysql.rb', line 380

def visit_ArelExtensions_Nodes_IsNotNull o, collector
  collector << 'NOT ISNULL('
    collector = visit o.expr, collector
    collector << ')'
    collector
end

#visit_ArelExtensions_Nodes_IsNull(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/mysql.rb', line 373

def visit_ArelExtensions_Nodes_IsNull o, collector
  collector << 'ISNULL('
  collector = visit o.expr, collector
  collector << ')'
  collector
end

#visit_ArelExtensions_Nodes_Json(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/mysql.rb', line 561

def visit_ArelExtensions_Nodes_Json o, collector
  return super if !json_supported?

  case o.dict
  when Array
    collector << 'JSON_ARRAY('
    o.dict.each.with_index do |v, i|
      if i != 0
        collector << COMMA
      end
      collector = visit v, collector
    end
    collector << ')'
  when Hash
    collector << 'JSON_OBJECT('
    o.dict.each.with_index do |(k, v), i|
      if i != 0
        collector << COMMA
      end
      collector = visit k, collector
      collector << COMMA
      collector = visit v, collector
    end
    collector << ')'
  else
    collector = visit o.dict, collector
  end
  collector
end

#visit_ArelExtensions_Nodes_JsonGet(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/mysql.rb', line 603

def visit_ArelExtensions_Nodes_JsonGet o, collector
  collector << 'JSON_EXTRACT('
  collector = visit o.dict, collector
  collector << COMMA
  if o.key.is_a?(Integer)
    collector << "\"$[#{o.key}]\""
  else
    collector = visit Arel.quoted('$.') + o.key, collector
  end
  collector << ')'
  collector
end

#visit_ArelExtensions_Nodes_JsonGroup(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/mysql.rb', line 631

def visit_ArelExtensions_Nodes_JsonGroup o, collector
  return super if !json_supported?

  if o.as_array
    collector << 'JSON_ARRAYAGG('
    collector = visit o.dict, collector
    collector << ')'
  else
    case o.dict
    when Hash
      collector << 'JSON_MERGE_PATCH(' if o.dict.length > 1
      o.dict.each.with_index do |(k, v), i|
        if i != 0
          collector << COMMA
        end
        collector << 'JSON_OBJECTAGG('
        collector = visit k, collector
        collector << COMMA
        collector = visit v, collector
        collector << ')'
      end
      collector << ')' if o.dict.length > 1
    else
      collector << 'JSON_OBJECTAGG('
      collector = visit o.dict, collector
      collector << ')'
    end
  end
  collector
end

#visit_ArelExtensions_Nodes_JsonMerge(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/mysql.rb', line 591

def visit_ArelExtensions_Nodes_JsonMerge o, collector
  collector << 'JSON_MERGE_PATCH('
  o.expressions.each.with_index do |v, i|
    if i != 0
      collector << COMMA
    end
    collector = visit v, collector
  end
  collector << ')'
  collector
end

#visit_ArelExtensions_Nodes_JsonSet(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/mysql.rb', line 616

def visit_ArelExtensions_Nodes_JsonSet o, collector
  collector << 'JSON_SET('
  collector = visit o.dict, collector
  collector << COMMA
  if o.key.is_a?(Integer)
    collector << "\"$[#{o.key}]\""
  else
    collector = visit Arel.quoted('$.') + o.key, collector
  end
  collector << COMMA
  collector = visit o.value, collector
  collector << ')'
  collector
end

#visit_ArelExtensions_Nodes_Log10(o, collector) ⇒ Object

Math functions



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# File 'lib/arel_extensions/visitors/mysql.rb', line 65

def visit_ArelExtensions_Nodes_Log10 o, collector
  collector << 'LOG10('
  o.expressions.each_with_index { |arg, i|
    collector << Arel::Visitors::ToSql::COMMA if i != 0
    collector = visit arg, collector
  }
  collector << ')'
  collector
end

#visit_ArelExtensions_Nodes_Ltrim(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/mysql.rb', line 219

def visit_ArelExtensions_Nodes_Ltrim o, collector
  collector << 'TRIM(LEADING '
  collector = visit o.right, collector
  collector << ' FROM '
  collector = visit o.left, collector
  collector << ')'
  collector
end

#visit_ArelExtensions_Nodes_Power(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/mysql.rb', line 75

def visit_ArelExtensions_Nodes_Power o, collector
  collector << 'POW('
  o.expressions.each_with_index { |arg, i|
    collector << Arel::Visitors::ToSql::COMMA if i != 0
    collector = visit arg, collector
  }
  collector << ')'
  collector
end

#visit_ArelExtensions_Nodes_RegexpReplace(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/mysql.rb', line 247

def visit_ArelExtensions_Nodes_RegexpReplace o, collector
  if !regexp_replace_supported?
    warn('Warning: ArelExtensions: REGEXP_REPLACE does not seem to be available in the current version of the DBMS, it might crash')
  end
  super(o, collector)
end

#visit_ArelExtensions_Nodes_Repeat(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/mysql.rb', line 237

def visit_ArelExtensions_Nodes_Repeat o, collector
  collector << 'REPEAT('
  o.expressions.each_with_index { |arg, i|
    collector << Arel::Visitors::ToSql::COMMA if i != 0
    collector = visit arg, collector
  }
  collector << ')'
  collector
end

#visit_ArelExtensions_Nodes_Rtrim(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/mysql.rb', line 228

def visit_ArelExtensions_Nodes_Rtrim o, collector
  collector << 'TRIM(TRAILING '
  collector = visit o.right, collector
  collector << ' FROM '
  collector = visit o.left, collector
  collector << ')'
  collector
end

#visit_ArelExtensions_Nodes_SMatches(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/mysql.rb', line 121

def visit_ArelExtensions_Nodes_SMatches o, collector
  collector = visit o.left.collate, collector
  collector << ' LIKE '
  collector = visit o.right.collate, collector
  if o.escape
    collector << ' ESCAPE '
    collector = visit o.escape, collector
  end
  collector
end

#visit_ArelExtensions_Nodes_Std(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/mysql.rb', line 518

def visit_ArelExtensions_Nodes_Std o, collector
  collector << (o.unbiased_estimator ? 'STDDEV_SAMP(' : 'STDDEV_POP(')
  visit o.left, collector
  collector << ')'
  visit_Aggregate_For_AggregateFunction o, collector
  collector
end

#visit_ArelExtensions_Nodes_Trim(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/mysql.rb', line 210

def visit_ArelExtensions_Nodes_Trim o, collector
  collector << 'TRIM(' # BOTH
  collector = visit o.right, collector
  collector << ' FROM '
  collector = visit o.left, collector
  collector << ')'
  collector
end

#visit_ArelExtensions_Nodes_Variance(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/mysql.rb', line 526

def visit_ArelExtensions_Nodes_Variance o, collector
  collector << (o.unbiased_estimator ? 'VAR_SAMP(' : 'VAR_POP(')
  visit o.left, collector
  collector << ')'
  visit_Aggregate_For_AggregateFunction o, collector
  collector
end

#visit_ArelExtensions_Nodes_Wday(o, collector) ⇒ Object 



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# File 'lib/arel_extensions/visitors/mysql.rb', line 387

def visit_ArelExtensions_Nodes_Wday o, collector
  collector << '(WEEKDAY('
  collector = visit o.date, collector
  collector << ') + 1) % 7'
  collector
end

#window_supported? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/arel_extensions/visitors/mysql.rb', line 539

def window_supported?
  version_supported?('10.2.3', '8.0')
end