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There's two forms of case: CASE (WHEN [bool expr] THEN [value])+ (ELSE [value])? END which checks a series of boolean conditions, and: CASE expr (WHEN [expr] THEN [value})+ (ELSE [value])? END Which checks a series of equality conditions. This implements support for both. Note that the ELSE is optional, and will be equivalent to `ELSE null` if not specified. sqlite3 gives the implementation as: sqlite> explain select case a WHEN a THEN b WHEN c THEN d ELSE 0 END from casetest; addr opcode p1 p2 p3 p4 p5 comment ---- ------------- ---- ---- ---- ------------- -- ------------- 0 Init 0 16 0 0 Start at 16 1 OpenRead 0 3 0 4 0 root=3 iDb=0; casetest 2 Rewind 0 15 0 0 3 Column 0 0 2 0 r[2]= cursor 0 column 0 4 Column 0 0 3 0 r[3]= cursor 0 column 0 5 Ne 3 8 2 BINARY-8 83 if r[2]!=r[3] goto 8 6 Column 0 1 1 0 r[1]= cursor 0 column 1 7 Goto 0 13 0 0 8 Column 0 2 3 0 r[3]= cursor 0 column 2 9 Ne 3 12 2 BINARY-8 83 if r[2]!=r[3] goto 12 10 Column 0 3 1 0 r[1]= cursor 0 column 3 11 Goto 0 13 0 0 12 Integer 0 1 0 0 r[1]=0 13 ResultRow 1 1 0 0 output=r[1] 14 Next 0 3 0 1 15 Halt 0 0 0 0 16 Transaction 0 0 2 0 1 usesStmtJournal=0 17 Goto 0 1 0 0 and after this patch, limbo gives: addr opcode p1 p2 p3 p4 p5 comment ---- ----------------- ---- ---- ---- ------------- -- ------- 0 Init 0 18 0 0 Start at 18 1 OpenReadAsync 0 4 0 0 table=casetest, root=4 2 OpenReadAwait 0 0 0 0 3 RewindAsync 0 0 0 0 4 RewindAwait 0 17 0 0 Rewind table casetest 5 Column 0 0 2 0 r[2]=casetest.a 6 Column 0 0 3 0 r[3]=casetest.a 7 Ne 2 3 10 0 if r[2]!=r[3] goto 10 8 Column 0 1 1 0 r[1]=casetest.b 9 Goto 0 14 0 0 10 Column 0 2 3 0 r[3]=casetest.c 11 Ne 2 3 14 0 if r[2]!=r[3] goto 14 12 Column 0 3 1 0 r[1]=casetest.d 13 Goto 0 14 0 0 14 ResultRow 1 1 0 0 output=r[1] 15 NextAsync 0 0 0 0 16 NextAwait 0 5 0 0 17 Halt 0 0 0 0 18 Transaction 0 0 0 0 19 Integer 0 1 0 0 r[1]=0 20 Goto 0 1 0 0 And then as there's nowhere to annotate this new support in COMPAT.md, I added a corresponding heading for SELECT expressions and what is/isn't supported.
77 lines
1.7 KiB
Tcl
Executable File
77 lines
1.7 KiB
Tcl
Executable File
#!/usr/bin/env tclsh
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set testdir [file dirname $argv0]
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source $testdir/tester.tcl
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do_execsql_test select-const-1 {
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SELECT 1
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} {1}
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do_execsql_test select-const-2 {
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SELECT 2
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} {2}
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do_execsql_test select-blob-empty {
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SELECT x'';
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} {}
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do_execsql_test select-blob-ascii {
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SELECT x'6C696D626f';
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} {limbo}
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do_execsql_test select-blob-emoji {
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SELECT x'F09FA680';
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} {🦀}
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do_execsql_test select-limit-0 {
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SELECT id FROM users LIMIT 0;
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} {}
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do_execsql_test realify {
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select price from products limit 1;
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} {79.0}
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do_execsql_test select-add {
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select u.age + 1 from users u where u.age = 91 limit 1;
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} {92}
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do_execsql_test select-subtract {
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select u.age - 1 from users u where u.age = 91 limit 1;
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} {90}
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do_execsql_test case-insensitive-columns {
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select u.aGe + 1 from USERS u where U.AGe = 91 limit 1;
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} {92}
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do_execsql_test table-star {
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select p.*, p.name from products p limit 1;
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} {1|hat|79.0|hat}
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do_execsql_test table-star-2 {
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select p.*, u.first_name from users u join products p on u.id = p.id limit 1;
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} {1|hat|79.0|Jamie}
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do_execsql_test seekrowid {
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select * from users u where u.id = 5;
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} {"5|Edward|Miller|christiankramer@example.com|725-281-1033|08522 English Plain|Lake Keith|ID|23283|15"}
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do_execsql_test select_parenthesized {
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select (price + 100) from products limit 1;
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} {179.0}
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do_execsql_test select_case_base_else {
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select case when 0 then 0 when 1 then 1 else 2 end;
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} {1}
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do_execsql_test select_case_noelse_null {
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select case when 0 then 0 end;
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} {}
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do_execsql_test select_base_case_else {
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select case 1 when 0 then 0 when 1 then 1 else 2 end;
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} {1}
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do_execsql_test select_base_case_noelse_null {
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select case 4 when 0 then 0 when 1 then 1 end;
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} {}
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