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new 3be7592 ARROW-11165: [Rust][DataFusion] Document Postgres as standard
SQL dialect
3be7592 is described below
commit 3be759251b5e2bacc18f1617c5118ae6e2218f68
Author: Andrew Lamb <[email protected]>
AuthorDate: Mon Jan 11 06:23:18 2021 -0500
ARROW-11165: [Rust][DataFusion] Document Postgres as standard SQL dialect
PROPOSAL Document postgres as the target SQL / function dialect and
rationale for this choice. I will also send an email to the dev mailing list
soliciting feedback
There are several comments and more discussion on
https://github.com/apache/arrow/pull/9108
Closes #9127 from alamb/alamb/ARROW-11165-dialect
Authored-by: Andrew Lamb <[email protected]>
Signed-off-by: Andrew Lamb <[email protected]>
---
rust/datafusion/README.md | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/rust/datafusion/README.md b/rust/datafusion/README.md
index c868825..7229dd5 100644
--- a/rust/datafusion/README.md
+++ b/rust/datafusion/README.md
@@ -91,6 +91,13 @@ This library currently supports the following SQL constructs:
* `GROUP BY` together with one of the following aggregations: `MIN`, `MAX`,
`COUNT`, `SUM`, `AVG`
* `ORDER BY` together with an expression and optional `ASC` or `DESC` and also
optional `NULLS FIRST` or `NULLS LAST`
+## Supported Functions
+
+DataFusion strives to implement a subset of the [PostgreSQL SQL
dialect](https://www.postgresql.org/docs/current/functions.html) where
possible. We explicitly choose a single dialect to maximize interoperability
with other tools and allow reuse of the PostgreSQL documents and tutorials as
much as possible.
+
+Currently, only a subset of the PosgreSQL dialect is implemented, and we will
document any deviations.
+
+
## Supported Data Types
DataFusion uses Arrow, and thus the Arrow type system, for query
