From b2ec1ea6eccbf8c0ad85fad228a290b702cdeb75 Mon Sep 17 00:00:00 2001
From: Alex Qyoun-ae <4062971+MazterQyou@users.noreply.github.com>
Date: Thu, 1 Dec 2022 04:21:24 +0400
Subject: [PATCH 1/3] feat: Add `APPROXIMATE` function keyword support

---
 src/ast/mod.rs                                |  5 +++
 src/keywords.rs                               |  1 +
 src/parser.rs                                 | 14 +++++++
 ..._clickhouse.rs => sqlparser_clickhouse.rs} |  2 +
 tests/sqlparser_common.rs                     | 18 +++++++++
 tests/sqlparser_mysql.rs                      |  5 +++
 tests/sqlparser_postgres.rs                   | 40 +++++++++++++++++++
 7 files changed, 85 insertions(+)
 rename tests/{sqpparser_clickhouse.rs => sqlparser_clickhouse.rs} (98%)

diff --git a/src/ast/mod.rs b/src/ast/mod.rs
index f7b447950..05516815e 100644
--- a/src/ast/mod.rs
+++ b/src/ast/mod.rs
@@ -2231,10 +2231,15 @@ pub struct Function {
     // aggregate functions may specify eg `COUNT(DISTINCT x)`
     pub distinct: bool,
     pub special: bool,
+    // Redshift provides `APPROXIMATE` option for some functions, e.g. `COUNT`
+    pub approximate: bool,
 }
 
 impl fmt::Display for Function {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        if self.approximate {
+            write!(f, "APPROXIMATE ")?;
+        }
         if self.special {
             write!(f, "{}", self.name)?;
         } else {
diff --git a/src/keywords.rs b/src/keywords.rs
index 06ab8731e..e61266b39 100644
--- a/src/keywords.rs
+++ b/src/keywords.rs
@@ -77,6 +77,7 @@ define_keywords!(
     AND,
     ANY,
     APPLY,
+    APPROXIMATE,
     ARE,
     ARRAY,
     ARRAY_AGG,
diff --git a/src/parser.rs b/src/parser.rs
index fbb7d747a..5788c5bd4 100644
--- a/src/parser.rs
+++ b/src/parser.rs
@@ -330,6 +330,17 @@ impl<'a> Parser<'a> {
                     }
                 }
             }
+            Token::Word(w)
+                if dialect_of!(self is RedshiftSqlDialect | PostgreSqlDialect | GenericDialect)
+                    && w.keyword == Keyword::APPROXIMATE
+                    && self.peek_token() != Token::Comma =>
+            {
+                let mut expr = self.parse_expr()?;
+                if let Expr::Function(fun) = &mut expr {
+                    fun.approximate = true;
+                    return Ok(WildcardExpr::Expr(expr));
+                }
+            }
             Token::Mul => {
                 return Ok(WildcardExpr::Wildcard);
             }
@@ -433,6 +444,7 @@ impl<'a> Parser<'a> {
                         over: None,
                         distinct: false,
                         special: true,
+                        approximate: false,
                     }))
                 }
                 Keyword::CURRENT_TIMESTAMP
@@ -620,6 +632,7 @@ impl<'a> Parser<'a> {
             over,
             distinct,
             special: false,
+            approximate: false,
         }))
     }
 
@@ -635,6 +648,7 @@ impl<'a> Parser<'a> {
             over: None,
             distinct: false,
             special: false,
+            approximate: false,
         }))
     }
 
diff --git a/tests/sqpparser_clickhouse.rs b/tests/sqlparser_clickhouse.rs
similarity index 98%
rename from tests/sqpparser_clickhouse.rs
rename to tests/sqlparser_clickhouse.rs
index 7e1ecaed8..583f8f8f9 100644
--- a/tests/sqpparser_clickhouse.rs
+++ b/tests/sqlparser_clickhouse.rs
@@ -52,6 +52,7 @@ fn parse_map_access_expr() {
                     over: None,
                     distinct: false,
                     special: false,
+                    approximate: false,
                 })],
             })],
             into: None,
@@ -88,6 +89,7 @@ fn parse_map_access_expr() {
                             over: None,
                             distinct: false,
                             special: false,
+                            approximate: false,
                         })]
                     }),
                     op: BinaryOperator::NotEq,
diff --git a/tests/sqlparser_common.rs b/tests/sqlparser_common.rs
index 04b91a43d..ebc9e340a 100644
--- a/tests/sqlparser_common.rs
+++ b/tests/sqlparser_common.rs
@@ -511,6 +511,7 @@ fn parse_select_count_wildcard() {
             over: None,
             distinct: false,
             special: false,
+            approximate: false,
         }),
         expr_from_projection(only(&select.projection))
     );
@@ -530,6 +531,7 @@ fn parse_select_count_distinct() {
             over: None,
             distinct: true,
             special: false,
+            approximate: false,
         }),
         expr_from_projection(only(&select.projection))
     );
@@ -1335,6 +1337,7 @@ fn parse_select_having() {
                 over: None,
                 distinct: false,
                 special: false,
+                approximate: false,
             })),
             op: BinaryOperator::Gt,
             right: Box::new(Expr::Value(number("1")))
@@ -2325,6 +2328,7 @@ fn parse_scalar_function_in_projection() {
                 over: None,
                 distinct: false,
                 special: false,
+                approximate: false,
             }),
             expr_from_projection(only(&select.projection))
         );
@@ -2404,6 +2408,7 @@ fn parse_named_argument_function() {
             over: None,
             distinct: false,
             special: false,
+            approximate: false,
         }),
         expr_from_projection(only(&select.projection))
     );
@@ -2438,6 +2443,7 @@ fn parse_window_functions() {
             }),
             distinct: false,
             special: false,
+            approximate: false,
         }),
         expr_from_projection(&select.projection[0])
     );
@@ -2547,6 +2553,7 @@ fn parse_expr_interval() {
             over: None,
             distinct: false,
             special: false,
+            approximate: false,
         });
 
         assert_eq!(
@@ -2579,6 +2586,7 @@ fn parse_expr_interval() {
             over: None,
             distinct: false,
             special: false,
+            approximate: false,
         });
         assert_eq!(
             &Expr::Value(Value::Interval {
@@ -2724,6 +2732,7 @@ fn parse_at_timezone() {
                 over: None,
                 distinct: false,
                 special: false,
+                approximate: false,
             })),
             time_zone: "UTC-06:00".to_string()
         },
@@ -2750,6 +2759,7 @@ fn parse_at_timezone() {
                             over: None,
                             distinct: false,
                             special: false,
+                            approximate: false,
                         },)),
                         time_zone: "UTC-06:00".to_string(),
                     },),),
@@ -2760,6 +2770,7 @@ fn parse_at_timezone() {
                 over: None,
                 distinct: false,
                 special: false,
+                approximate: false,
             },),
             alias: Ident {
                 value: "hour".to_string(),
@@ -2796,6 +2807,7 @@ fn parse_table_function() {
                 over: None,
                 distinct: false,
                 special: false,
+                approximate: false,
             });
             assert_eq!(expr, expected_expr);
             assert_eq!(alias, table_alias("a"))
@@ -2853,6 +2865,7 @@ fn parse_delimited_identifiers() {
             over: None,
             distinct: false,
             special: false,
+            approximate: false,
         }),
         expr_from_projection(&select.projection[1]),
     );
@@ -4763,6 +4776,7 @@ fn parse_time_functions() {
             over: None,
             distinct: false,
             special: false,
+            approximate: false,
         }),
         expr_from_projection(&select.projection[0])
     );
@@ -4779,6 +4793,7 @@ fn parse_time_functions() {
             over: None,
             distinct: false,
             special: false,
+            approximate: false,
         }),
         expr_from_projection(&select.projection[0])
     );
@@ -4795,6 +4810,7 @@ fn parse_time_functions() {
             over: None,
             distinct: false,
             special: false,
+            approximate: false,
         }),
         expr_from_projection(&select.projection[0])
     );
@@ -4811,6 +4827,7 @@ fn parse_time_functions() {
             over: None,
             distinct: false,
             special: false,
+            approximate: false,
         }),
         expr_from_projection(&select.projection[0])
     );
@@ -4827,6 +4844,7 @@ fn parse_time_functions() {
             over: None,
             distinct: false,
             special: false,
+            approximate: false,
         }),
         expr_from_projection(&select.projection[0])
     );
diff --git a/tests/sqlparser_mysql.rs b/tests/sqlparser_mysql.rs
index 37952e780..c3204f156 100644
--- a/tests/sqlparser_mysql.rs
+++ b/tests/sqlparser_mysql.rs
@@ -694,6 +694,7 @@ fn parse_insert_with_on_duplicate_update() {
                             over: None,
                             distinct: false,
                             special: false,
+                            approximate: false,
                         })
                     },
                     Assignment {
@@ -706,6 +707,7 @@ fn parse_insert_with_on_duplicate_update() {
                             over: None,
                             distinct: false,
                             special: false,
+                            approximate: false,
                         })
                     },
                     Assignment {
@@ -718,6 +720,7 @@ fn parse_insert_with_on_duplicate_update() {
                             over: None,
                             distinct: false,
                             special: false,
+                            approximate: false,
                         })
                     },
                     Assignment {
@@ -730,6 +733,7 @@ fn parse_insert_with_on_duplicate_update() {
                             over: None,
                             distinct: false,
                             special: false,
+                            approximate: false,
                         })
                     },
                     Assignment {
@@ -742,6 +746,7 @@ fn parse_insert_with_on_duplicate_update() {
                             over: None,
                             distinct: false,
                             special: false,
+                            approximate: false,
                         })
                     },
                 ])),
diff --git a/tests/sqlparser_postgres.rs b/tests/sqlparser_postgres.rs
index cd5e55492..c10dfef76 100644
--- a/tests/sqlparser_postgres.rs
+++ b/tests/sqlparser_postgres.rs
@@ -1418,6 +1418,7 @@ fn parse_current_functions() {
             over: None,
             distinct: false,
             special: true,
+            approximate: false,
         }),
         expr_from_projection(&select.projection[0])
     );
@@ -1428,6 +1429,7 @@ fn parse_current_functions() {
             over: None,
             distinct: false,
             special: true,
+            approximate: false,
         }),
         expr_from_projection(&select.projection[1])
     );
@@ -1438,6 +1440,7 @@ fn parse_current_functions() {
             over: None,
             distinct: false,
             special: true,
+            approximate: false,
         }),
         expr_from_projection(&select.projection[2])
     );
@@ -1448,6 +1451,7 @@ fn parse_current_functions() {
             over: None,
             distinct: false,
             special: true,
+            approximate: false,
         }),
         expr_from_projection(&select.projection[3])
     );
@@ -1571,3 +1575,39 @@ fn parse_pg_extract() {
         res.unwrap_err()
     );
 }
+
+#[test]
+fn parse_approximate_count() {
+    let sql = "SELECT APPROXIMATE COUNT(DISTINCT column)";
+    let select = pg_and_generic().verified_only_select(sql);
+    assert_eq!(
+        &Expr::Function(Function {
+            name: ObjectName(vec!["COUNT".into()]),
+            args: vec![FunctionArg::Unnamed(FunctionArgExpr::Expr(
+                Expr::Identifier(Ident::new("column"))
+            )),],
+            over: None,
+            distinct: true,
+            special: false,
+            approximate: true,
+        }),
+        expr_from_projection(only(&select.projection)),
+    );
+
+    let sql = "SELECT APPROXIMATE AS alias";
+    let select = pg_and_generic().verified_only_select(sql);
+    assert_eq!(
+        SelectItem::ExprWithAlias {
+            expr: Expr::Identifier(Ident::new("APPROXIMATE")),
+            alias: Ident::new("alias"),
+        },
+        select.projection[0]
+    );
+
+    let sql = "SELECT APPROXIMATE, COUNT(DISTINCT column)";
+    let select = pg_and_generic().verified_only_select(sql);
+    assert_eq!(
+        SelectItem::UnnamedExpr(Expr::Identifier(Ident::new("APPROXIMATE"))),
+        select.projection[0]
+    );
+}

From c8467a6466d4fb0f912e36caf0c501d08bd27930 Mon Sep 17 00:00:00 2001
From: Alex Qyoun-ae <4062971+MazterQyou@users.noreply.github.com>
Date: Thu, 1 Dec 2022 03:11:17 +0400
Subject: [PATCH 2/3] ci: Lock Rust toolchain

---
 .github/workflows/rust.yml | 10 +++++-----
 rust-toolchain             |  2 +-
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index 07bb67bef..bd3d8ba72 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -11,11 +11,9 @@ jobs:
         uses: hecrj/setup-rust-action@v1
         with:
           components: rustfmt
-          # Note that `nightly` is required for `license_template_path`, as
-          # it's an unstable feature.
-          rust-version: nightly
+          rust-version: nightly-2022-03-08
       - uses: actions/checkout@v2
-      - run: cargo +nightly fmt -- --check --config-path <(echo 'license_template_path = "HEADER"')
+      - run: cargo fmt -- --check --config-path <(echo 'license_template_path = "HEADER"')
 
   lint:
     runs-on: ubuntu-latest
@@ -24,6 +22,7 @@ jobs:
         uses: hecrj/setup-rust-action@v1
         with:
           components: clippy
+          rust-version: nightly-2022-03-08
       - uses: actions/checkout@v2
       - run: cargo clippy --all-targets --all-features -- -D warnings
 
@@ -42,13 +41,14 @@ jobs:
         uses: hecrj/setup-rust-action@v1
         with:
           targets: 'thumbv6m-none-eabi'
+          rust-version: nightly-2022-03-08
       - uses: actions/checkout@master
       - run: cargo check --no-default-features --target thumbv6m-none-eabi
 
   test:
     strategy:
       matrix:
-        rust: [stable, beta, nightly]
+        rust: [stable, beta, nightly, nightly-2022-03-08]
     runs-on: ubuntu-latest
     steps:
     - name: Setup Rust
diff --git a/rust-toolchain b/rust-toolchain
index 870bbe4e5..f367a50f0 100644
--- a/rust-toolchain
+++ b/rust-toolchain
@@ -1 +1 @@
-stable
\ No newline at end of file
+nightly-2022-03-08

From b7407b99320fc4fc6fe17242ae7c4116bc97e47a Mon Sep 17 00:00:00 2001
From: Alex Qyoun-ae <4062971+MazterQyou@users.noreply.github.com>
Date: Thu, 1 Dec 2022 03:14:24 +0400
Subject: [PATCH 3/3] chore: Lock dependencies versions

---
 .gitignore |   4 -
 Cargo.lock | 314 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 314 insertions(+), 4 deletions(-)
 create mode 100644 Cargo.lock

diff --git a/.gitignore b/.gitignore
index 6dfd81a68..ceff7cbfa 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,10 +3,6 @@
 /target/
 /sqlparser_bench/target/
 
-# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
-# More information here http://doc.crates.io/guide.html#cargotoml-vs-cargolock
-Cargo.lock
-
 # These are backup files generated by rustfmt
 **/*.rs.bk
 
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 000000000..9a0581ba7
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,314 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "ansi_term"
+version = "0.12.1"
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+ "winapi",
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+
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+ "hermit-abi",
+ "libc",
+ "winapi",
+]
+
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+name = "autocfg"
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+
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