andygrove commented on issue #4072:
URL: 
https://github.com/apache/arrow-datafusion/issues/4072#issuecomment-1301281410

   Here is the spec for SQL numeric literals:
   
   ```
   <signed numeric literal> ::=
   [ <sign> ] <unsigned numeric literal>
   
   <unsigned numeric literal> ::=
   <exact numeric literal>
   | <approximate numeric literal>
   
   <exact numeric literal> ::=
   <unsigned integer> [ <period> [ <unsigned integer> ] ]
   | <period> <unsigned integer>
   
   <sign> ::=
   <plus sign>
   | <minus sign>
   
   <approximate numeric literal> ::=
   <mantissa> E <exponent>
   
   <mantissa> ::=
   <exact numeric literal>
   
   <exponent> ::=
   <signed integer>
   
   <signed integer> ::=
   [ <sign> ] <unsigned integer>
   
   <unsigned integer> ::=
   <digit>...
   ```


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