diff --git a/sql/src/main/java/org/opensearch/sql/sql/parser/AstExpressionBuilder.java b/sql/src/main/java/org/opensearch/sql/sql/parser/AstExpressionBuilder.java
index a5d071ef951..dda2aa592c6 100644
--- a/sql/src/main/java/org/opensearch/sql/sql/parser/AstExpressionBuilder.java
+++ b/sql/src/main/java/org/opensearch/sql/sql/parser/AstExpressionBuilder.java
@@ -9,6 +9,7 @@
 import static org.opensearch.sql.ast.dsl.AstDSL.between;
 import static org.opensearch.sql.ast.dsl.AstDSL.not;
 import static org.opensearch.sql.ast.dsl.AstDSL.qualifiedName;
+import static org.opensearch.sql.ast.dsl.AstDSL.stringLiteral;
 import static org.opensearch.sql.expression.function.BuiltinFunctionName.IS_NOT_NULL;
 import static org.opensearch.sql.expression.function.BuiltinFunctionName.IS_NULL;
 import static org.opensearch.sql.expression.function.BuiltinFunctionName.LIKE;