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In the source code I suppose there’s a table object, but how are the elements of a table stored in that object? With a vector, linked list, tree, or something else? I can never seem to find things when I download the source of huge programs with lots of classes and was just curious about this.
There are several different table implementations that can be used in MySQL. Typically, disk-based trees are implemented using variations of a b-tree http://en.wikipedia.org/wiki/B-tree