feat: sql dialect for different protocols (#1631)

* feat: add SqlDialect to query context

* feat: use session in postgrel handlers

* chore: refactor sql dialect

* feat: use different dialects for different sql protocols

* feat: adds GreptimeDbDialect

* refactor: replace GenericDialect with GreptimeDbDialect

* feat: save user info to session

* fix: compile error

* fix: test

src/query/src/parser.rs

@@ -26,7 +26,7 @@ use promql_parser::parser::ast::{Extension as NodeExtension, ExtensionExpr};
 use promql_parser::parser::Expr::Extension;
 use promql_parser::parser::{EvalStmt, Expr, ValueType};
 use snafu::ResultExt;
-use sql::dialect::GenericDialect;
+use sql::dialect::GreptimeDbDialect;
 use sql::parser::ParserContext;
 use sql::statements::statement::Statement;
 
@@ -108,7 +108,7 @@ pub struct QueryLanguageParser {}
 impl QueryLanguageParser {
     pub fn parse_sql(sql: &str) -> Result<QueryStatement> {
         let _timer = timer!(METRIC_PARSE_SQL_ELAPSED);
-        let mut statement = ParserContext::create_with_dialect(sql, &GenericDialect {})
+        let mut statement = ParserContext::create_with_dialect(sql, &GreptimeDbDialect {})
             .map_err(BoxedError::new)
             .context(QueryParseSnafu {
                 query: sql.to_string(),

src/query/src/sql/show.rs

@@ -20,7 +20,7 @@ use sql::ast::{
     ColumnDef, ColumnOption, ColumnOptionDef, Expr, ObjectName, SqlOption, TableConstraint,
     Value as SqlValue,
 };
-use sql::dialect::GenericDialect;
+use sql::dialect::GreptimeDbDialect;
 use sql::parser::ParserContext;
 use sql::statements::create::{CreateTable, TIME_INDEX};
 use sql::statements::{self};
@@ -108,7 +108,7 @@ fn create_column_def(column_schema: &ColumnSchema) -> Result<ColumnDef> {
                     .with_context(|_| ConvertSqlValueSnafu { value: v.clone() })?,
             ),
             ColumnDefaultConstraint::Function(expr) => {
-                ParserContext::parse_function(expr, &GenericDialect {}).context(SqlSnafu)?
+                ParserContext::parse_function(expr, &GreptimeDbDialect {}).context(SqlSnafu)?
             }
         };