pprint hard to read for deeply indented expressions

Currently looking at a `pprint` of the TPCH Q1 and this thing is much larger than I anticipated (that may be a bug on it's own and apparently already fixed)

Anyhow, for the deeply indented expressions it's very hard to read where they are. Some ascii art might be helpful her

For example....
```python
Assign
|
|
| ------ Projection
```

What I got instead

```python
SortValues: by=['l_returnflag', 'l_linestatus']
ResetIndex:
GroupbyAggregation: by=['l_returnflag', 'l_linestatus'] arg={'sum_qty': 'sum', 'sum_base_price': 'sum', 'sum_disc_price': 'sum', 'sum_charge': 'sum', 'avg_qty': 'mean', 'avg_price': 'mean', 'avg_disc': 'mean', 'count_order': 'count'}
Assign: key='count_order'
Assign: key='avg_disc'
Assign: key='sum_charge'
Assign: key='sum_disc_price'
Assign: key='avg_price'
Assign: key='avg_qty'
Assign: key='sum_base_price'
Assign: key='sum_qty'
Filter:
ReadParquet: path='s3://coiled-runtime-ci/tpch_scale_100/lineitem' kwargs={'dtype_backend': None}
LE: right=datetime.datetime(1998, 9, 2, 0, 0)
Projection: columns='l_shipdate'
ReadParquet: path='s3://coiled-runtime-ci/tpch_scale_100/lineitem' kwargs={'dtype_backend': None}
Projection: columns='l_quantity'
Filter:
ReadParquet: path='s3://coiled-runtime-ci/tpch_scale_100/lineitem' kwargs={'dtype_backend': None}
LE: right=datetime.datetime(1998, 9, 2, 0, 0)
Projection: columns='l_shipdate'
ReadParquet: path='s3://coiled-runtime-ci/tpch_scale_100/lineitem' kwargs={'dtype_backend': None}
Projection: columns='l_extendedprice'
Assign: key='sum_qty'
Filter:
ReadParquet: path='s3://coiled-runtime-ci/tpch_scale_100/lineitem' kwargs={'dtype_backend': None}
LE: right=datetime.datetime(1998, 9, 2, 0, 0)
Projection: columns='l_shipdate'
ReadParquet: path='s3://coiled-runtime-ci/tpch_scale_100/lineitem' kwargs={'dtype_backend': None}
Projection: columns='l_quantity'
Filter:
ReadParquet: path='s3://coiled-runtime-ci/tpch_scale_100/lineitem' kwargs={'dtype_backend': None}
LE: right=datetime.datetime(1998, 9, 2, 0, 0)
Projection: columns='l_shipdate'
ReadParquet: path='s3://coiled-runtime-ci/tpch_scale_100/lineitem' kwargs={'dtype_backend': None}
Projection: columns='l_quantity'
```