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b4e3d4ac2f
In the DynamoDB API, when "a" is a list attribute, a[999] returns the
1000th element. But if the list isn't that long (e.g., it only has 5
elements), a[999] returns nothing - it's not an error.
But it turns out that when the index is so long that it can't even be
parsed as an integer, e.g., 99999999999999, DynamoDB does report an
error:
Invalid ProjectionExpression: List index is not within the
allowable range; index: [99999999999999]
Before this patch, Alternator also returned an error in this case,
with the right type (ValidationException), but with a strange low-level
error text:
Failed parsing ProjectionExpression 'a[99999999999999]':
std::out_of_range (stoi)
The problem was that the code (in alternator/expressions.g) ran stoi()
without converting its std::out_of_range exception to a better user-facing
message. We do this in this patch, and the error message now looks like:
Failed parsing ProjectionExpression 'a[99999999999999]':
list index out of integer range
This patch also includes a test reproducing this error, which passes
on DynamDB and on Alternator it fails before this patch and passes with
the patch.
Fixes #25947
Signed-off-by: Nadav Har'El <nyh@scylladb.com>
Closes scylladb/scylladb#25951