** Return a list of pointers to strings which are the names of all ** columns in table zTab. The memory to hold the names is dynamically ** allocated and must be released by the caller using a subsequent call ** to freeColumnList(). ** ** The azCol[0] entry is usually NULL. However, if zTab contains a rowid ** value that needs to be preserved, then azCol[0] is filled in with the ** name of the
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