Replace FromStr with normal parser function for FileFormat (apache#201)

The previous version accepted quoting file format keywords
(`STORED AS "TEXTFILE"`) and was inconsistent with the
way WindowFrameUnits was parsed.

Author: Dandandan

src/ast/mod.rs

@@ -835,29 +835,6 @@ impl fmt::Display for FileFormat {
     }
 }
 
-use crate::parser::ParserError;
-use std::str::FromStr;
-impl FromStr for FileFormat {
-    type Err = ParserError;
-
-    fn from_str(s: &str) -> Result<Self, Self::Err> {
-        use self::FileFormat::*;
-        match s {
-            "TEXTFILE" => Ok(TEXTFILE),
-            "SEQUENCEFILE" => Ok(SEQUENCEFILE),
-            "ORC" => Ok(ORC),
-            "PARQUET" => Ok(PARQUET),
-            "AVRO" => Ok(AVRO),
-            "RCFILE" => Ok(RCFILE),
-            "JSONFILE" => Ok(JSONFILE),
-            _ => Err(ParserError::ParserError(format!(
-                "Unexpected file format: {}",
-                s
-            ))),
-        }
-    }
-}
-
 /// A `LISTAGG` invocation `LISTAGG( [ DISTINCT ] <expr>[, <separator> ] [ON OVERFLOW <on_overflow>] ) )
 /// [ WITHIN GROUP (ORDER BY <within_group1>[, ...] ) ]`
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]

src/dialect/keywords.rs

@@ -84,6 +84,7 @@ define_keywords!(
     ATOMIC,
     AUTHORIZATION,
     AVG,
+    AVRO,
     BEGIN,
     BEGIN_FRAME,
     BEGIN_PARTITION,
@@ -231,6 +232,7 @@ define_keywords!(
     IS,
     ISOLATION,
     JOIN,
+    JSONFILE,
     KEY,
     LAG,
     LANGUAGE,
@@ -291,6 +293,7 @@ define_keywords!(
     ONLY,
     OPEN,
     OR,
+    ORC,
     ORDER,
     OUT,
     OUTER,
@@ -318,6 +321,7 @@ define_keywords!(
     PROCEDURE,
     RANGE,
     RANK,
+    RCFILE,
     READ,
     READS,
     REAL,
@@ -356,6 +360,7 @@ define_keywords!(
     SECOND,
     SELECT,
     SENSITIVE,
+    SEQUENCEFILE,
     SERIALIZABLE,
     SESSION,
     SESSION_USER,
@@ -389,6 +394,7 @@ define_keywords!(
     TABLE,
     TABLESAMPLE,
     TEXT,
+    TEXTFILE,
     THEN,
     TIES,
     TIME,

src/parser.rs

@@ -1006,12 +1006,7 @@ impl Parser {
         let table_name = self.parse_object_name()?;
         let (columns, constraints) = self.parse_columns()?;
         self.expect_keywords(&[Keyword::STORED, Keyword::AS])?;
-        // We probably shouldn't parse the file format as an identifier..
-        let file_format = self
-            .parse_identifier()?
-            .value
-            .to_ascii_uppercase()
-            .parse::<FileFormat>()?;
+        let file_format = self.parse_file_format()?;
 
         self.expect_keyword(Keyword::LOCATION)?;
         let location = self.parse_literal_string()?;
@@ -1028,6 +1023,22 @@ impl Parser {
         })
     }
 
+    pub fn parse_file_format(&mut self) -> Result<FileFormat, ParserError> {
+        match self.next_token() {
+            Token::Word(w) => match w.keyword {
+                Keyword::AVRO => Ok(FileFormat::AVRO),
+                Keyword::JSONFILE => Ok(FileFormat::JSONFILE),
+                Keyword::ORC => Ok(FileFormat::ORC),
+                Keyword::PARQUET => Ok(FileFormat::PARQUET),
+                Keyword::RCFILE => Ok(FileFormat::RCFILE),
+                Keyword::SEQUENCEFILE => Ok(FileFormat::SEQUENCEFILE),
+                Keyword::TEXTFILE => Ok(FileFormat::TEXTFILE),
+                _ => self.expected("fileformat", Token::Word(w)),
+            },
+            unexpected => self.expected("fileformat", unexpected),
+        }
+    }
+
     pub fn parse_create_view(&mut self) -> Result<Statement, ParserError> {
         let materialized = self.parse_keyword(Keyword::MATERIALIZED);
         self.expect_keyword(Keyword::VIEW)?;