can we execute sql on dataframe like spark?
Like spark-sql,can we execute sql on dataframe to transform data ?
for example:
```python
import pandas as pd
df=pd.DataFrame({"a":[1,1,2],"b":[2,3,4]})
df
# 		a	b
# 	0	1	2
# 	1	1	3
# 	2	2	4
df.create_temp_view("t")
result=df.sql("select a, sum(b) from t group by a")
result
# 		a	sum(b)
# 	0	1	5
# 	1	2	4

```
