feat(flink): support NOT NULL syntax (#103)

* feat(flink): support NOT NULL syntax

* feat(flinksql): support NULL

src/grammar/flinksql/FlinkSqlParser.g4

@@ -180,7 +180,7 @@ rowTypeDimension
     ;
 
 columnConstraint
-    :(KW_CONSTRAINT constraintName)? KW_PRIMARY KW_KEY KW_NOT KW_ENFORCED
+    :(KW_CONSTRAINT constraintName)? KW_PRIMARY KW_KEY (KW_NOT KW_ENFORCED)? | KW_NOT? KW_NULL
     ;
 
 commentSpec

src/lib/flinksql/FlinkSqlLexer.ts

@@ -1,4 +1,4 @@
-// Generated from /Users/hayden/Desktop/dt-works/dt-sql-parser/src/grammar/flinksql/FlinkSqlLexer.g4 by ANTLR 4.12.0
+// Generated from /Users/mortalYoung/Projects/dt-sql-parser/src/grammar/flinksql/FlinkSqlLexer.g4 by ANTLR 4.12.0
 // noinspection ES6UnusedImports,JSUnusedGlobalSymbols,JSUnusedLocalSymbols
 import {
 	ATN,

src/lib/flinksql/FlinkSqlParserListener.ts

@@ -1,4 +1,4 @@
-// Generated from /Users/hayden/Desktop/dt-works/dt-sql-parser/src/grammar/flinksql/FlinkSqlParser.g4 by ANTLR 4.12.0
+// Generated from /Users/mortalYoung/Projects/dt-sql-parser/src/grammar/flinksql/FlinkSqlParser.g4 by ANTLR 4.12.0
 
 import {ParseTreeListener} from "antlr4";
 

src/lib/flinksql/FlinkSqlParserVisitor.ts

@@ -1,4 +1,4 @@
-// Generated from /Users/hayden/Desktop/dt-works/dt-sql-parser/src/grammar/flinksql/FlinkSqlParser.g4 by ANTLR 4.12.0
+// Generated from /Users/mortalYoung/Projects/dt-sql-parser/src/grammar/flinksql/FlinkSqlParser.g4 by ANTLR 4.12.0
 
 import {ParseTreeVisitor} from 'antlr4';
 

test/parser/flinksql/syntax/fixtures/createTable.sql

@@ -2,6 +2,15 @@ CREATE TABLE MyTable ('user_id' BIGINT, 'name' STRING) WITH ('connector' = 'orac
 
 CREATE TABLE MyTable WITH ('connector' = 'oracle-x');
 
+CREATE TEMPORARY TABLE client_errors (
+    log_time TIMESTAMP(3),
+    request_line STRING,
+    status_code STRING,
+    size INT
+) WITH (
+    'connector' = 'stream-x'
+);
+
 -- 尽管官方文档的 BNF 里没有支持创建临时表，但实际上是支持的
 CREATE TEMPORARY TABLE MyTable ('user_id' BIGINT, 'name' STRING) WITH ('connector' = 'oracle-x');
 
@@ -232,3 +241,64 @@ CREATE TABLE tbl1 (
    OVERWRITING OPTIONS
    EXCLUDING CONSTRAINTS
 );
+
+CREATE TEMPORARY TABLE server_logs (
+    client_ip STRING,
+    client_identity STRING,
+    userid STRING,
+    user_agent STRING,
+    log_time TIMESTAMP(3),
+    request_line STRING,
+    status_code STRING,
+    size INT
+) WITH (
+    'connector' = 'faker'
+);
+
+CREATE TEMPORARY TABLE aggregations1 (
+    `browser`     STRING,
+    `status_code` STRING,
+    `end_time`    TIMESTAMP(3),
+    `requests`    BIGINT NOT NULL
+) WITH (
+    'connector' = 'blackhole'
+);
+
+CREATE TABLE dt_catalog.dt_db.doctor_sightings (
+    doctor        STRING,
+    sighting_time TIMESTAMP(3),
+    WATERMARK FOR sighting_time AS sighting_time - INTERVAL '15' SECONDS
+) WITH (
+    'connector' = 'faker'
+);
+
+
+CREATE TABLE dt_catalog.dt_db.bids (
+    bid_id STRING,
+    currency_code STRING,
+    bid_price DOUBLE,
+    transaction_time TIMESTAMP(3),
+    WATERMARK FOR transaction_time AS transaction_time - INTERVAL '5' SECONDS  -- 定义事件时间，允许的最大窗口延迟为5s
+) WITH (
+    'connector' = 'faker'
+);
+
+
+CREATE TABLE dt_catalog.dt_db.currency_rates (
+    `currency_code` STRING,
+    `eur_rate` DECIMAL(6,4),
+    `rate_time` TIMESTAMP(3),
+    WATERMARK FOR `rate_time` AS rate_time - INTERVAL '15' SECONDS, -- 定义事件时间
+    PRIMARY KEY (currency_code) NOT ENFORCED -- 定义主键
+) WITH (
+    'connector' = 'faker'
+);
+
+CREATE TABLE dt_catalog.dt_db.users (
+    -- That was weird, NOT ENFORCED should have been necessary but we got a demo like the following and it could work!
+    user_id INT PRIMARY KEY, 
+    user_name VARCHAR(255) NOT NULL,
+    age INT NULL
+) WITH (
+    'connector' = 'faker'
+);

test/parser/flinksql/syntax/fixtures/createView.sql

@@ -35,3 +35,22 @@ SELECT
     col1
 FROM
     tbl;
+
+CREATE TEMPORARY VIEW browsers AS 
+SELECT
+    REGEXP_EXTRACT(user_agent,'[^\/]+') AS browser,
+    status_code,
+    log_time
+FROM 
+    server_logs;
+
+CREATE VIEW server_logs_window_1m AS
+SELECT 
+    TUMBLE_START(log_time, INTERVAL '1' MINUTE) AS window_start,
+    TUMBLE_ROWTIME(log_time, INTERVAL '1' MINUTE) AS window_end,
+    SUM(size) AS total_size,
+    COUNT(*) AS num_requests
+FROM 
+    server_logs
+GROUP BY
+    TUMBLE(log_time, INTERVAL '1' MINUTE);