CreateQuery mv_primary_key_from_column (children 4)
 Identifier mv_primary_key_from_column
 Columns definition (children 2)
  ExpressionList (children 1)
   ColumnDeclaration key (children 1)
    DataType String
  Function tuple (children 1)
   ExpressionList (children 1)
    Identifier key
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 2)
    ExpressionList (children 1)
     Asterisk
    TablesInSelectQuery (children 1)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       TableIdentifier data
 ViewTargets (children 1)
  Storage definition (children 1)
   Function MergeTree
