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expressions: make unknown column distinguishable - #17
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This patch makes "UnKnownColumn" expression distinguishable from actual "Column" expression to have an ability to compare them in planning tests. For now "UnKnownColumn" string representation is started from `?` symbol, for example, `partitioning=Hash([`?a@0`], 1)`.
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This patch makes "UnKnownColumn" expression distinguishable from actual "Column" expression to have an ability to compare them in planning tests. For now "UnKnownColumn" string representation is started from
?symbol, for example,partitioning=Hash([?a@0], 1).