fix: include lower-case identifiers among those that need quotes (#3723) #5139
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…fluentinc#3723) IdentifierUtils::needsQuotes is used by various code that formats SQL text to decide what identifiers to wrap in quotes. Before this change, this just included reserved identifiers. However, identifiers that include lower-case characters should also be quoted. Otherwise, when the parser parses them it will convert them to upper-case. So this patch changes needsQuotes to check for lower-case characters. For schema inference, we don't want to quote column names generated from lower-case avro schema fields. To handle this, this patch adds IdentifierUtils.isValid, that only returns true if the identifier is valid (parsable). Schema inference uses this to only quote invalid identifiers.
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Description
Backport #3723
Fixes #5032
Testing done
Describe the testing strategy. Unit and integration tests are expected for any behavior changes.
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