[jira] [Created] (CALCITE-4247) When parsing SQL in BigQuery dialect, character literals may be enclosed in single- or double-quotes, and use backslashes as escapes

[Julian Hyde (Jira)]

Julian Hyde created CALCITE-4247:
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             Summary: When parsing SQL in BigQuery dialect, character literals 
may be enclosed in single- or double-quotes, and use backslashes as escapes
                 Key: CALCITE-4247
                 URL: https://issues.apache.org/jira/browse/CALCITE-4247
             Project: Calcite
          Issue Type: Bug
            Reporter: Julian Hyde


When parsing SQL in BigQuery dialect, character literals may be enclosed in 
single- or double-quotes, and use backslashes as escapes. In standard SQL, and 
most dialects, character literals are enclosed in single-quotes only, and use 
single-quotes as the escape character.

For example:
{noformat}
'Let''s call him "Elvis"!' /* valid in Oracle, PostgreSQL, etc. */
'Let\'s call him "Elvis"!' /* valid in BigQuery */
"Let's call him \"Elvis\"!" /* valid in BigQuery */
{noformat}

To control this feature, we add
{code}
enum CharLiteralStyle { STANDARD, BQ_SINGLE, BQ_DOUBLE }
{code}
and to {{interface SqlParser.Config}} we add method {{Set<CharLiteralStyle> 
charLiteralStyles()}}.



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