SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Function trimLeft (children 1)
     ExpressionList (children 1)
      Identifier explain
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 2)
          ExpressionList (children 1)
           Asterisk
          TablesInSelectQuery (children 1)
           TablesInSelectQueryElement (children 1)
            TableExpression (children 1)
             Function viewExplain (children 1)
              ExpressionList (children 3)
               Literal \'EXPLAIN\'
               Literal \'projections = 1\'
               Subquery (children 1)
                SelectWithUnionQuery (children 1)
                 ExpressionList (children 1)
                  SelectQuery (children 3)
                   ExpressionList (children 1)
                    Asterisk
                   TablesInSelectQuery (children 1)
                    TablesInSelectQueryElement (children 1)
                     TableExpression (children 1)
                      TableIdentifier test_simple_projection
                   Function and (children 1)
                    ExpressionList (children 2)
                     Function notEquals (children 1)
                      ExpressionList (children 2)
                       Identifier region
                       Literal \'unknown\'
                     Function notEquals (children 1)
                      ExpressionList (children 2)
                       Identifier user_id
                       Literal UInt64_999
   Function or (children 1)
    ExpressionList (children 2)
     Function like (children 1)
      ExpressionList (children 2)
       Identifier explain
       Literal \'%ReadFromMergeTree%\'
     Function match (children 1)
      ExpressionList (children 2)
       Identifier explain
       Literal \'^\\\\s+[A-Z][a-z]+(\\\\s+[A-Z][a-z]+)*:\'
