TAJO-1068: Add SQL Query documentation.

[hyunsik]

No description provided.

[hyunsik]

I've updated the explanation of the groupby clause. Could you anyone review this?

[mhthanh]

If nobody reviews your doc in the weekend, I will review it next Monday ;-)

[hyunsik]

@mhthanh Thanks a lot!

[mhthanh]

Overall, the patch looks good to me and I think that it will be useful for Tajo users.
Besides, there are a few typos (all in "queries.rst") as follows.

• Line 37: "Aliase" -> "Aliases"
• Line 57: "a long table references" -> "long table references"
• Line 79: "Catesian product" -> "Cartesian product"
• Line 193: "an descending order" -> "a descending order"
• Line 240: "any expressions and aggregation functions are allowed in ORDER BY clause" -> this makes me confused. Does it mean "all expressions and aggregation functions are allowed in ORDER BY clause" ?

[hyunsik]

Hi @mhthanh,

I greatly appreciate your review and contributions. Thank you for fixing the errors. I'll reflect all your comments.

You are right for Line 240. I'll fix it.

[hsaputra]

Aliases ?

[hyunsik]

Hi @mhthanh and @hsaputra,

Thank you all for your revision. I reflected your comments and updated the patch.

[hsaputra]

+1 LGTM

[hyunsik]

Thank you @hsaputra for the quick review! I'll commit it shortly.