impl Debug trait for Column

[Veeupup]

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Summary

add Debug impl for Column for better debugging, just like below:

PrimitiveColumn          typeid: UInt8   len: 2  data: [1, 2]
PrimitiveColumn          typeid: Float32         len: 2  data: [1, 2]
NullColumn       typeid: Null    len: 3  data: [NULL...]
BooleanColumn    typeid: Boolean         len: 3  data: [true, false, true]
StringColumn     typeid: String  len: 2  data: [aaa, bbb]
NullableColumn   typeid: Int32   len: 3  data: [NULL, NULL, 12]
ArrayColumn      typeid: Array   len: 3  data: [[test], [data, bend], [hello, world, NULL]]
StructColumn     typeid: Struct  len: 3  data: [[18869, 1], [18948, 2], [1, 3]]

Changelog

• Improvement

Related Issues

Fixes #issue

Test Plan

Unit Tests

Stateless Tests

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[codecov-commenter]

Codecov Report

Merging #3965 (9630eb5) into datavalues-dev (4c6325b) will decrease coverage by 0%.
The diff coverage is 2%.

@@               Coverage Diff               @@
##           datavalues-dev   #3965    +/-   ##
===============================================
- Coverage              57%     57%    -1%     
===============================================
  Files                 809     811     +2     
  Lines               43663   43815   +152     
===============================================
+ Hits                24999   25051    +52     
- Misses              18664   18764   +100     

Impacted Files	Coverage Δ
common/datavalues2/src/columns/array/mod.rs	24% <0%> (-3%)	⬇️
common/datavalues2/src/columns/column.rs	40% <0%> (-12%)	⬇️
common/datavalues2/src/columns/null/mod.rs	0% <0%> (ø)
common/datavalues2/src/columns/nullable/mod.rs	68% <0%> (-6%)	⬇️
common/datavalues2/src/columns/string/mod.rs	66% <0%> (-3%)	⬇️
common/datavalues2/src/columns/struct_/mod.rs	20% <0%> (-3%)	⬇️
common/datavalues2/src/data_value.rs	20% <0%> (+1%)	⬆️
common/datavalues2/src/columns/boolean/mod.rs	67% <16%> (-5%)	⬇️
common/datavalues2/src/columns/primitive/mod.rs	61% <16%> (-1%)	⬇️
...mon/functions/src/scalars/strings/string2number.rs	20% <0%> (-40%)	⬇️
... and 53 more

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