Support join strictness after type (RIGHT ANTI JOIN)

ClickHouse allows join strictness modifiers (ANTI, SEMI, ANY, ALL, ASOF)
either before or after the join type. This fix adds support for parsing
strictness after the type, enabling queries like:
- RIGHT ANTI JOIN
- LEFT SEMI JOIN
etc.

10 tests now pass with this fix.

Author: claude

parser/parser.go

@@ -1004,6 +1004,27 @@ func (p *Parser) parseTableElementWithJoin() *ast.TablesInSelectQueryElement {
 		join.Type = ast.JoinInner
 	}
 
+	// Parse strictness after type if not already parsed (e.g., RIGHT ANTI JOIN)
+	if join.Strictness == "" {
+		switch p.current.Token {
+		case token.ANY:
+			join.Strictness = ast.JoinStrictAny
+			p.nextToken()
+		case token.ALL:
+			join.Strictness = ast.JoinStrictAll
+			p.nextToken()
+		case token.ASOF:
+			join.Strictness = ast.JoinStrictAsof
+			p.nextToken()
+		case token.SEMI:
+			join.Strictness = ast.JoinStrictSemi
+			p.nextToken()
+		case token.ANTI:
+			join.Strictness = ast.JoinStrictAnti
+			p.nextToken()
+		}
+	}
+
 	if !p.expect(token.JOIN) {
 		return nil
 	}

parser/testdata/02724_mutliple_storage_join/metadata.json

@@ -1,6 +1 @@
-{
-  "explain_todo": {
-    "stmt7": true,
-    "stmt8": true
-  }
-}
+{}

parser/testdata/02769_compare_functions_nan/metadata.json

@@ -1,5 +1 @@
-{
-  "explain_todo": {
-    "stmt24": true
-  }
-}
+{}

parser/testdata/03015_aggregator_empty_data_multiple_blocks/metadata.json

@@ -1,5 +1 @@
-{
-  "explain_todo": {
-    "stmt3": true
-  }
-}
+{}

parser/testdata/03211_convert_outer_join_to_inner_join_anti_join/metadata.json

@@ -1,8 +1 @@
-{
-  "explain_todo": {
-    "stmt10": true,
-    "stmt13": true,
-    "stmt16": true,
-    "stmt8": true
-  }
-}
+{}

parser/testdata/03214_join_on_tuple_comparison_elimination_bug/metadata.json

@@ -1,8 +1,5 @@
 {
   "explain_todo": {
-    "stmt10": true,
-    "stmt7": true,
-    "stmt8": true,
-    "stmt9": true
+    "stmt8": true
   }
 }

parser/testdata/03402_concurrent_right_full_join/metadata.json

@@ -1 +1 @@
-{"explain_todo":{"stmt24":true}}
+{}

parser/testdata/03580_join_runtime_filter/metadata.json

@@ -4,8 +4,6 @@
     "stmt28": true,
     "stmt30": true,
     "stmt32": true,
-    "stmt33": true,
-    "stmt34": true,
-    "stmt35": true
+    "stmt34": true
   }
 }

parser/testdata/03623_convert_any_join_to_semi_or_anti_2/metadata.json

@@ -1,6 +1 @@
-{
-  "explain_todo": {
-    "stmt8": true,
-    "stmt9": true
-  }
-}
+{}

parser/testdata/03708_analyzer_convert_any_outer_to_inner_2/metadata.json

@@ -1,9 +1,5 @@
 {
   "explain_todo": {
-    "stmt10": true,
-    "stmt11": true,
-    "stmt12": true,
-    "stmt8": true,
-    "stmt9": true
+    "stmt12": true
   }
 }