avantgardnerio opened a new issue, #4957:
URL: https://github.com/apache/arrow-datafusion/issues/4957
**Describe the bug**
It's not really a bug, more of an API regression. When #4607 got merged,
consumers of the DataFusion public API lost the ability to (easily) inspect or
alter the AST of a SQL statement before it got planned. This is because the
function that runs it became non-trivial in that it copies tables into a new
context, so now the consumer would either have to duplicate the table copying
logic, or go without.
**To Reproduce**
This used to work:
```
let statements = DFParser::parse_sql(sql)?;
let statements: Vec<_> = statements.into_iter().collect();
// Do something with AST here
let state = df_ctx.state();
let planner = SqlToRel::new(&state);
let plan = planner.statement_to_plan(stmt).map_err(|e| err!("", e))?;
let df = Arc::new(DataFrame::new(df_ctx.state(), plan));
```
But now it yields: `ContextProvider not implented for SessionState`
**Expected behavior**
A way to parse, manipulate AST, then plan separately.
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