feat: add show search_path for pg (#5328)

Signed-off-by: yihong0618 <zouzou0208@gmail.com>

src/sql/src/parsers/show_parser.rs

@@ -22,8 +22,8 @@ use crate::error::{
 use crate::parser::ParserContext;
 use crate::statements::show::{
     ShowColumns, ShowCreateDatabase, ShowCreateFlow, ShowCreateTable, ShowCreateTableVariant,
-    ShowCreateView, ShowDatabases, ShowFlows, ShowIndex, ShowKind, ShowStatus, ShowTableStatus,
-    ShowTables, ShowVariables, ShowViews,
+    ShowCreateView, ShowDatabases, ShowFlows, ShowIndex, ShowKind, ShowSearchPath, ShowStatus,
+    ShowTableStatus, ShowTables, ShowVariables, ShowViews,
 };
 use crate::statements::statement::Statement;
 
@@ -107,6 +107,8 @@ impl ParserContext<'_> {
             Ok(Statement::ShowVariables(ShowVariables { variable }))
         } else if self.consume_token("STATUS") {
             Ok(Statement::ShowStatus(ShowStatus {}))
+        } else if self.consume_token("SEARCH_PATH") {
+            Ok(Statement::ShowSearchPath(ShowSearchPath {}))
         } else {
             self.unsupported(self.peek_token_as_string())
         }

src/sql/src/statements/show.rs

@@ -289,6 +289,16 @@ impl Display for ShowStatus {
     }
 }
 
+/// SQL structure for "SHOW SEARCH_PATH" postgres only
+#[derive(Debug, Clone, PartialEq, Eq, Visit, VisitMut, Serialize)]
+pub struct ShowSearchPath {}
+
+impl Display for ShowSearchPath {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "SHOW SEARCH_PATH")
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use std::assert_matches::assert_matches;

src/sql/src/statements/statement.rs

@@ -36,8 +36,8 @@ use crate::statements::query::Query;
 use crate::statements::set_variables::SetVariables;
 use crate::statements::show::{
     ShowColumns, ShowCreateDatabase, ShowCreateFlow, ShowCreateTable, ShowCreateView,
-    ShowDatabases, ShowFlows, ShowIndex, ShowKind, ShowStatus, ShowTableStatus, ShowTables,
-    ShowVariables, ShowViews,
+    ShowDatabases, ShowFlows, ShowIndex, ShowKind, ShowSearchPath, ShowStatus, ShowTableStatus,
+    ShowTables, ShowVariables, ShowViews,
 };
 use crate::statements::tql::Tql;
 use crate::statements::truncate::TruncateTable;
@@ -102,6 +102,8 @@ pub enum Statement {
     ShowCreateView(ShowCreateView),
     // SHOW STATUS
     ShowStatus(ShowStatus),
+    // SHOW SEARCH_PATH
+    ShowSearchPath(ShowSearchPath),
     // SHOW VIEWS
     ShowViews(ShowViews),
     // DESCRIBE TABLE
@@ -159,6 +161,7 @@ impl Display for Statement {
             Statement::ShowCreateView(s) => s.fmt(f),
             Statement::ShowViews(s) => s.fmt(f),
             Statement::ShowStatus(s) => s.fmt(f),
+            Statement::ShowSearchPath(s) => s.fmt(f),
             Statement::DescribeTable(s) => s.fmt(f),
             Statement::Explain(s) => s.fmt(f),
             Statement::Copy(s) => s.fmt(f),