cht42 commented on issue #7453:
URL: https://github.com/apache/arrow-rs/issues/7453#issuecomment-2839129097
FYI, I'm using the following code to achieve this
```rust
// Returns the raw string value of the JSON value. Used when incorrect types
are
// encountered in the JSON input. This is used to replicate Spark's behavior
// when decoding JSON.
fn decode_any(s: &mut String, tape: &Tape<'_>, pos: u32) -> Result<(),
ArrowError> {
match tape.get(pos) {
TapeElement::StartObject(end) => {
s.push('{');
let mut cur_idx = pos + 1;
let mut key = true;
while cur_idx < end {
decode_any(s, tape, cur_idx)?;
cur_idx = tape.next(cur_idx, "json")?;
if cur_idx < end {
if key {
s.push(':');
} else {
s.push(',');
}
key = !key;
}
}
s.push('}');
}
TapeElement::StartList(end) => {
s.push('[');
let mut cur_idx = pos + 1;
while cur_idx < end {
decode_any(s, tape, cur_idx)?;
cur_idx = tape.next(cur_idx, "json")?;
if cur_idx < end {
s.push(',');
}
}
s.push(']');
}
TapeElement::String(idx) => {
s.push('"');
s.push_str(tape.get_string(idx));
s.push('"');
}
TapeElement::Number(idx) => s.push_str(tape.get_string(idx)),
TapeElement::I64(high) => match tape.get(pos + 1) {
TapeElement::I32(low) => {
let val = ((high as i64) << 32) | (low as u32) as i64;
s.push_str(&val.to_string());
}
_ => unreachable!(),
},
TapeElement::I32(n) => s.push_str(&n.to_string()),
TapeElement::F32(n) => s.push_str(&n.to_string()),
TapeElement::F64(high) => match tape.get(pos + 1) {
TapeElement::F32(low) => {
let val = f64::from_bits(((high as u64) << 32) | low as u64);
s.push_str(&val.to_string());
}
_ => unreachable!(),
},
TapeElement::True => s.push_str("true"),
TapeElement::False => s.push_str("false"),
TapeElement::Null => s.push_str("null"),
el => unreachable!("unexpected {:?}", el),
}
Ok(())
}
```
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