feat: implemented the alias real for float

Author: wszhdshys

src/types/mod.rs

@@ -406,6 +406,7 @@ impl TryFrom<sqlparser::ast::DataType> for LogicalType {
                 Ok(LogicalType::Varchar(None, CharLengthUnits::Characters))
             }
             sqlparser::ast::DataType::Float(_) => Ok(LogicalType::Float),
+            sqlparser::ast::DataType::Real => Ok(LogicalType::Float),
             sqlparser::ast::DataType::Double | sqlparser::ast::DataType::DoublePrecision => {
                 Ok(LogicalType::Double)
             }

tests/slt/sql_2016/E011_02.slt

@@ -9,9 +9,8 @@ CREATE TABLE TABLE_E011_02_01_02 ( ID INT PRIMARY KEY, A FLOAT ( 2 ) )
 statement ok
 CREATE TABLE TABLE_E011_02_01_03 ( ID INT PRIMARY KEY, A FLOAT )
 
-# TODO: REAL
-# statement ok
-# CREATE TABLE TABLE_E011_02_01_04 ( ID INT PRIMARY KEY, A REAL )
+statement ok
+CREATE TABLE TABLE_E011_02_01_04 ( ID INT PRIMARY KEY, A REAL )
 
 query R
 SELECT +7.8