Support named argument assignment operator in DDL statements

src/main/java/com/google/cloud/solutions/spannerddl/parser/ASTcolumn_type.java

@@ -62,7 +62,14 @@ public String toString() {
         // length.
         return typeName + "(" + ((ASTlength) children[0]) + ")";
       case "ARRAY":
-        return "ARRAY<" + ((ASTcolumn_type) children[0]) + ">";
+        String arrayType = "ARRAY<" + ((ASTcolumn_type) children[0]) + ">";
+        if (jjtGetNumChildren() > 1) {
+          return arrayType
+              + "(vector_length=>"
+              + ((SimpleNode) children[1]).jjtGetLastToken().toString()
+              + ")";
+        }
+        return arrayType;
       case "PG": // PG.pgtype
         return AstTreeUtils.tokensToString(this).toUpperCase(Locale.ROOT);
       case "STRUCT":

src/main/jjtree-sources/ddl_expression.jjt

@@ -27,6 +27,7 @@ void googlesql_operator() :
   | "-"
   | "*"
   | "/"
+  | "=>"
   | "="
   | "!="
   | "<>"

src/main/jjtree-sources/ddl_parser.jjt

@@ -393,7 +393,7 @@ void column_type() :
   | <UUID>
   | <INTERVAL>
   | <ARRAY> "<" column_type() ">"
-      [ "(" <VECTOR_LENGTH> "="">" <INTEGER_LITERAL> #vector_length ")"]
+      [ "(" <VECTOR_LENGTH> "=>" <INTEGER_LITERAL> #vector_length ")"]
   | <TOKENLIST>
   | <STRUCT> ( "<" struct_fields() ">" | "<>" )
   | dotted_path()

src/test/resources/ddlParserValidation.txt

@@ -215,4 +215,12 @@ CREATE TABLE test1 ( keycol INT64 NOT NULL PRIMARY KEY, value INT64 )
 
 CREATE TABLE test1 ( keycol INT64, value INT64 )
 
+== Test 24 named params using => in generation expression
+
+CREATE TABLE test_named_params ( key INT64, key_tokens TOKENLIST AS ( TOKENIZE_SUBSTRING ( key, ngram_size_min => 3, ngram_size_max => 3, relative_search_types => [ 'word_prefix' ] ) ) HIDDEN ) PRIMARY KEY (key)
+
+== Test 25 ARRAY with vector_length=>
+
+CREATE TABLE test_vector_length ( key INT64, embedding ARRAY<FLOAT32>(vector_length=>128) ) PRIMARY KEY (key)
+
 ==

src/test/resources/expectedDdlDiff.txt

@@ -379,5 +379,9 @@ ALTER TABLE mytable SET OPTIONS (locality_group='lg2')
 
 ALTER TABLE mytable SET OPTIONS (droppedKey=NULL,newKey='value2')
 
+== TEST 75 create table with named params using =>
+
+CREATE TABLE test_named_params ( key INT64, key_tokens TOKENLIST AS ( tokenize_substring ( key, ngram_size_min => 3, ngram_size_max => 3, relative_search_types => [ 'word_prefix' ] ) ) HIDDEN ) PRIMARY KEY (key)
+
 ==
 

src/test/resources/newDdl.txt

@@ -592,4 +592,11 @@ create table mytable (keycol int64) primary key(keycol), OPTIONS(locality_group
 
 create table mytable (keycol int64) primary key(keycol), OPTIONS(existingKey='value', newKey='value2')
 
+== TEST 75 create table with named params using =>
+
+create table test_named_params (
+  key int64,
+  key_tokens tokenlist as (tokenize_substring(key, ngram_size_min=>3, ngram_size_max=>3, relative_search_types=>['word_prefix'])) hidden
+) primary key (key);
+
 ==

src/test/resources/originalDdl.txt

@@ -591,5 +591,9 @@ create table mytable (keycol int64) primary key(keycol), OPTIONS(locality_group
 
 create table mytable (keycol int64) primary key(keycol), OPTIONS(existingKey='value', droppedKey='value1')
 
+== TEST 75 create table with named params using =>
+
+-- Nothing here
+
 ==