[jira] [Created] (ASTERIXDB-1964) add type conversion functions to_boolean(), to_string(), to_double(), to_bigint()

[Dmitry Lychagin (JIRA)]

Dmitry Lychagin created ASTERIXDB-1964:
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             Summary: add type conversion functions to_boolean(), to_string(), 
to_double(), to_bigint()
                 Key: ASTERIXDB-1964
                 URL: https://issues.apache.org/jira/browse/ASTERIXDB-1964
             Project: Apache AsterixDB
          Issue Type: Improvement
          Components: FUN - Functions
            Reporter: Dmitry Lychagin
            Priority: Minor


We need to add type conversion functions to_boolean(), to_string(), 
to_double(), to_bigint() that convert their argument to corresponding type but 
do not fail if that conversion is unsuccessful



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