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MXS-1196: Do not parse EXPLAIN statements

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EXPLAIN statements are no longer parsed completely as doing so makes
it hard to modify the grammar for the needs or Oracle SQL.

Consequently, for an EXPLAIN statement you now bascially only get the
type and the operation (the newly added QUERY_OP_EXPLAIN and QUERY_OP_SHOW).
The other information is not interesting and is related to
information_schema and similar tables.
This commit is contained in:
Johan Wikman
2017-05-15 13:28:29 +03:00
parent 951c96383c
commit 43ab0f036e
5 changed files with 377 additions and 358 deletions
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29
query_classifier/qc_sqlite/sqlite-src-3110100/src/parse.y
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@ -113,7 +113,7 @@ extern void maxscaleDeallocate(Parse*, Token* pName);
extern void maxscaleDo(Parse*, ExprList* pEList);
extern void maxscaleDrop(Parse*, MxsDrop* pDrop);
extern void maxscaleExecute(Parse*, Token* pName);
extern void maxscaleExplain(Parse*, SrcList* pName);
extern void maxscaleExplain(Parse*, Token* pNext);
extern void maxscaleFlush(Parse*, Token* pWhat);
extern void maxscaleHandler(Parse*, mxs_handler_t, SrcList* pFullName, Token* pName);
extern void maxscaleLoadData(Parse*, SrcList* pFullName);
@ -276,33 +276,22 @@ input ::= cmdlist.
cmdlist ::= cmdlist ecmd.
cmdlist ::= ecmd.
ecmd ::= SEMI.
ecmd ::= explain cmdx SEMI.
ecmd ::= explain SEMI.
ecmd ::= cmdx SEMI.
%ifdef MAXSCALE
explain_kw ::= EXPLAIN. // Also covers DESCRIBE
explain_kw ::= DESC.
ecmd ::= explain_kw fullname(X) SEMI. {
pParse->explain = 1;
maxscaleExplain(pParse, X);
}
explain ::= explain_kw. { pParse->explain = 1; }
// deferred_id is defined later, after the id token_class has been defined.
ecmd ::= explain FOR deferred_id INTEGER SEMI. { // FOR CONNECTION connection_id
explain ::= explain_kw deferred_id(A). { maxscaleExplain(pParse, &A); }
explain ::= explain_kw deferred_id(A) DOT deferred_id. { maxscaleExplain(pParse, &A); }
ecmd ::= explain FOR(A) deferred_id INTEGER SEMI. { // FOR CONNECTION connection_id
pParse->explain = 1;
maxscaleExplain(pParse, 0);
maxscaleExplain(pParse, &A);
}
%endif
explain ::= .
%ifndef SQLITE_OMIT_EXPLAIN
%ifdef MAXSCALE
explain_type_opt ::= .
explain_type_opt ::= deferred_id. // EXTENDED | PARTITIONS
explain_type_opt ::= deferred_id eq deferred_id. // FORMAT = {TRADITIONAL|JSON}
explain ::= explain_kw explain_type_opt. { pParse->explain = 1; }
%endif
%ifndef MAXSCALE
explain ::= EXPLAIN. { pParse->explain = 1; }
%endif
%ifndef MAXSCALE
explain ::= EXPLAIN QUERY PLAN. { pParse->explain = 2; }
%endif
@ -2675,7 +2664,7 @@ type_options(A) ::= type_options CHARACTER SET ids. {A|=8;}
type_options(A) ::= type_options CHARSET ids. {A|=8;}
// deferred_id is used instead of id before the token_class id has been defined.
deferred_id ::= id.
deferred_id(A) ::= id(X). {A=X;}
as_opt ::= .
as_opt ::= AS.