Fix discriminator column defaults #5590
Merged
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DiscriminatorColumn mapping generated by all 3 metadata drivers (annot, yml, xml) was lacking length and type when only the name is specified in the mapping. Even though this results in a columnDef that generates a string column of length 255, the mapping for the discriminator column should have those fields set properly, and should be consistent with the behavior when no discriminator column mapping is specified at all.
Adjusted docs to properly reflect that the @DiscriminatorColumn annotation is optional.
Closes: #1601