Get string query back from a parsed ASTNode tree use HiveParser
My case is :
1. Use HiveParser to parse a string sql query:SELECT pageid, adid FROM pageAds LATERAL VIEW explode(adid_list) adTable AS adid
2. After parsed, I got a ASTNode tree like this :
nil
TOK_QUERY
TOK_FROM
TOK_LATERAL_VIEW
TOK_SELECT
TOK_SELEXPR
TOK_FUNCTION
explode
TOK_TABLE_OR_COL
adid_list
adid
TOK_TABALIAS
adTable
TOK_TABREF
TOK_TABNAME
pageAds
TOK_INSERT
TOK_DESTINATION
TOK_DIR
TOK_TMP_FILE
TOK_SELECT
TOK_SELEXPR
TOK_TABLE_OR_COL
pageid
TOK_SELEXPR
TOK_TABLE_OR_COL
adid
<EOF>
3. Then I need to change the tableName from pageAds to pageAds_uniqueSuffix.
4. At last, I should deparse this ASTNode tree to a string query again, and it should looks like :SELECT pageid, adid FROM pageAds_uniqueSuffix LATERAL VIEW explode(adid_list) adTable AS adid
====================================
I managed first 2 steps but really stuck at step 4.
Simply string replacement won't help because there are many situations that wouldn't work
sql hive hiveql abstract-syntax-tree sql-parser
asked Nov 14 '18 at 2:47
AI JoesAI Joes
297
add a comment |
My case is :
1. Use HiveParser to parse a string sql query:SELECT pageid, adid FROM pageAds LATERAL VIEW explode(adid_list) adTable AS adid
2. After parsed, I got a ASTNode tree like this :
nil
TOK_QUERY
TOK_FROM
TOK_LATERAL_VIEW
TOK_SELECT
TOK_SELEXPR
TOK_FUNCTION
explode
TOK_TABLE_OR_COL
adid_list
adid
TOK_TABALIAS
adTable
TOK_TABREF
TOK_TABNAME
pageAds
TOK_INSERT
TOK_DESTINATION
TOK_DIR
TOK_TMP_FILE
TOK_SELECT
TOK_SELEXPR
TOK_TABLE_OR_COL
pageid
TOK_SELEXPR
TOK_TABLE_OR_COL
adid
<EOF>
3. Then I need to change the tableName from pageAds to pageAds_uniqueSuffix.
4. At last, I should deparse this ASTNode tree to a string query again, and it should looks like :SELECT pageid, adid FROM pageAds_uniqueSuffix LATERAL VIEW explode(adid_list) adTable AS adid
====================================
I managed first 2 steps but really stuck at step 4.
Simply string replacement won't help because there are many situations that wouldn't work
sql hive hiveql abstract-syntax-tree sql-parser
asked Nov 14 '18 at 2:47
AI JoesAI Joes
297
add a comment |
My case is :
1. Use HiveParser to parse a string sql query:SELECT pageid, adid FROM pageAds LATERAL VIEW explode(adid_list) adTable AS adid
2. After parsed, I got a ASTNode tree like this :
nil
TOK_QUERY
TOK_FROM
TOK_LATERAL_VIEW
TOK_SELECT
TOK_SELEXPR
TOK_FUNCTION
explode
TOK_TABLE_OR_COL
adid_list
adid
TOK_TABALIAS
adTable
TOK_TABREF
TOK_TABNAME
pageAds
TOK_INSERT
TOK_DESTINATION
TOK_DIR
TOK_TMP_FILE
TOK_SELECT
TOK_SELEXPR
TOK_TABLE_OR_COL
pageid
TOK_SELEXPR
TOK_TABLE_OR_COL
adid
<EOF>
3. Then I need to change the tableName from pageAds to pageAds_uniqueSuffix.
4. At last, I should deparse this ASTNode tree to a string query again, and it should looks like :SELECT pageid, adid FROM pageAds_uniqueSuffix LATERAL VIEW explode(adid_list) adTable AS adid
====================================
I managed first 2 steps but really stuck at step 4.
Simply string replacement won't help because there are many situations that wouldn't work
sql hive hiveql abstract-syntax-tree sql-parser
asked Nov 14 '18 at 2:47
AI JoesAI Joes
297
My case is :
1. Use HiveParser to parse a string sql query:SELECT pageid, adid FROM pageAds LATERAL VIEW explode(adid_list) adTable AS adid
2. After parsed, I got a ASTNode tree like this :
nil
TOK_QUERY
TOK_FROM
TOK_LATERAL_VIEW
TOK_SELECT
TOK_SELEXPR
TOK_FUNCTION
explode
TOK_TABLE_OR_COL
adid_list
adid
TOK_TABALIAS
adTable
TOK_TABREF
TOK_TABNAME
pageAds
TOK_INSERT
TOK_DESTINATION
TOK_DIR
TOK_TMP_FILE
TOK_SELECT
TOK_SELEXPR
TOK_TABLE_OR_COL
pageid
TOK_SELEXPR
TOK_TABLE_OR_COL
adid
<EOF>
3. Then I need to change the tableName from pageAds to pageAds_uniqueSuffix.
4. At last, I should deparse this ASTNode tree to a string query again, and it should looks like :SELECT pageid, adid FROM pageAds_uniqueSuffix LATERAL VIEW explode(adid_list) adTable AS adid
====================================
I managed first 2 steps but really stuck at step 4.
Simply string replacement won't help because there are many situations that wouldn't work
sql hive hiveql abstract-syntax-tree sql-parser
sql hive hiveql abstract-syntax-tree sql-parser
asked Nov 14 '18 at 2:47
AI JoesAI Joes
297
asked Nov 14 '18 at 2:47
AI JoesAI Joes
297
edited Nov 14 '18 at 4:40
AI Joes
asked Nov 14 '18 at 2:47
AI JoesAI Joes
297
asked Nov 14 '18 at 2:47
AI JoesAI Joes
297
asked Nov 14 '18 at 2:47
AI JoesAI Joes
297
297
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