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* type-specific typanalyze function.
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* Note: do not assume that the data being analyzed has the same datatype
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* shown in attr, ie do not trust attr->atttypid, attlen, etc. This is
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* shown in attr, ie do not trust attr->atttypid, attlen, etc. This is
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* because some index opclasses store a different type than the underlying
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* column/expression. Instead use attrtypid, attrtypmod, and attrtype for
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* information about the datatype being fed to the typanalyze function.