From 26b7ab7b49254f1b954e3d375dc2f57036d7d380 Mon Sep 17 00:00:00 2001
From: Akshay Joshi <akshay.joshi@enterprisedb.com>
Date: Tue, 24 Feb 2026 18:27:55 +0530
Subject: [PATCH] Fixed an issue where EXPLAIN and EXPLAIN ANALYZE not working
 if blank line is there in the SQL query.

---
 .../ReactCodeMirror/CustomEditorView.js       | 286 +++++++++++-------
 .../components/CodeMirrorCustomEditor.spec.js |  30 ++
 2 files changed, 213 insertions(+), 103 deletions(-)

diff --git a/web/pgadmin/static/js/components/ReactCodeMirror/CustomEditorView.js b/web/pgadmin/static/js/components/ReactCodeMirror/CustomEditorView.js
index 5bdf79ffe5e..3a4c9b8537c 100644
--- a/web/pgadmin/static/js/components/ReactCodeMirror/CustomEditorView.js
+++ b/web/pgadmin/static/js/components/ReactCodeMirror/CustomEditorView.js
@@ -50,136 +50,216 @@ export default class CustomEditorView extends EditorView {
     return this.state.sliceDoc();
   }
 
-  /* Function to extract query based on position passed */
-  getQueryAt(currPos) {
-    try {
-      if(typeof currPos == 'undefined') {
-        currPos = this.state.selection.main.head;
+  /* Helper to check if extracted SQL is a complete/valid query.
+   * Returns true if the query is complete (can stand alone).
+   * Returns false if the query is incomplete (e.g., WHERE without SELECT).
+   */
+  isCompleteQuery(startPos, endPos) {
+    const query = this.state.sliceDoc(startPos, endPos).trim();
+    if (!query) return true; // Empty is considered "complete" (nothing to expand)
+
+    const tree = syntaxTree(this.state);
+    let hasStatement = false;
+    let hasOnlyComments = true;
+    let hasError = false;
+
+    tree.iterate({
+      from: startPos,
+      to: endPos,
+      enter: (node) => {
+        if (node.type.name === 'Statement') {
+          hasStatement = true;
+          hasOnlyComments = false;
+        }
+        if (node.type.isError) {
+          hasError = true;
+        }
+        // Check for non-comment content
+        if (node.type.name !== 'LineComment' &&
+            node.type.name !== 'BlockComment' &&
+            node.type.name !== 'Script') {
+          hasOnlyComments = false;
+        }
       }
-      const tree = syntaxTree(this.state);
+    });
 
-      let origLine = this.state.doc.lineAt(currPos);
-      let startPos = currPos;
+    // Comments alone are considered complete (they're a valid block)
+    if (hasOnlyComments && !hasStatement) {
+      return true;
+    }
 
-      // Move the startPos a known node type or a space.
-      // We don't want to be in an unknown teritory
-      for(;startPos<origLine.to; startPos++) {
-        let node = tree.resolve(startPos);
-        if(node.type.name != 'Script') {
-          break;
-        }
-        const currChar = this.state.sliceDoc(startPos, startPos+1);
-        if(currChar == ' ' || currChar == '\t') {
+    // Check if query starts with a comment - if so, consider it complete
+    // (comments followed by queries should stop at blank line)
+    const trimmedQuery = query.replace(/^\s+/, '');
+    if (trimmedQuery.startsWith('--') || trimmedQuery.startsWith('/*')) {
+      return true;
+    }
+
+    // Get the first word/token of the query (ignoring leading whitespace)
+    const firstWord = trimmedQuery.split(/[\s\n\r(;]+/)[0].toUpperCase();
+
+    // Valid SQL statement starters - a complete query must start with one of these
+    const validStarters = [
+      'SELECT', 'INSERT', 'UPDATE', 'DELETE', 'CREATE', 'ALTER', 'DROP',
+      'TRUNCATE', 'GRANT', 'REVOKE', 'COMMIT', 'ROLLBACK', 'BEGIN',
+      'END', 'SAVEPOINT', 'RELEASE', 'SET', 'SHOW', 'EXPLAIN', 'ANALYZE',
+      'VACUUM', 'REINDEX', 'CLUSTER', 'COMMENT', 'COPY', 'DO', 'LOCK',
+      'NOTIFY', 'LISTEN', 'UNLISTEN', 'LOAD', 'RESET', 'DISCARD',
+      'DECLARE', 'FETCH', 'MOVE', 'CLOSE', 'PREPARE', 'EXECUTE',
+      'DEALLOCATE', 'WITH', 'TABLE', 'VALUES', 'CALL', 'IMPORT', 'MERGE',
+      'REFRESH', 'SECURITY', 'REASSIGN', 'ABORT', 'START', 'CHECKPOINT',
+    ];
+
+    // If the query doesn't start with a valid statement starter, it's incomplete
+    if (!validStarters.includes(firstWord)) {
+      return false;
+    }
+
+    // A statement without syntax errors is complete
+    return hasStatement && !hasError;
+  }
+
+  /* Internal helper to find query boundaries with blank line as boundary */
+  _findQueryBoundaries(currPos, tree, stopAtBlankLine = true) {
+    let origLine = this.state.doc.lineAt(currPos);
+    let startPos = currPos;
+
+    // Move the startPos to a known node type or a space
+    for(;startPos<origLine.to; startPos++) {
+      let node = tree.resolve(startPos);
+      if(node.type.name != 'Script') {
+        break;
+      }
+      const currChar = this.state.sliceDoc(startPos, startPos+1);
+      if(currChar == ' ' || currChar == '\t') {
+        break;
+      }
+    }
+
+    let maxEndPos = this.state.doc.length;
+    let statementStartPos = -1;
+    let validTextFound = false;
+
+    // Go in reverse direction to get the start position
+    while(startPos >= 0) {
+      const currLine = this.state.doc.lineAt(startPos);
+
+      // If empty line then start with prev line
+      // If empty line in between then that's it
+      if(currLine.text.trim() == '') {
+        if(origLine.number != currLine.number && stopAtBlankLine) {
+          startPos = currLine.to + 1;
           break;
         }
+        startPos = currLine.from - 1;
+        continue;
       }
 
-      let maxEndPos = this.state.doc.length;
-      let statementStartPos = -1;
-      let validTextFound = false;
-
-      // we'll go in reverse direction to get the start position.
-      while(startPos >= 0) {
-        const currLine = this.state.doc.lineAt(startPos);
-
-        // If empty line then start with prev line
-        // If empty line in between then that's it
-        if(currLine.text.trim() == '') {
-          if(origLine.number != currLine.number) {
-            startPos = currLine.to + 1;
-            break;
-          }
-          startPos = currLine.from - 1;
-          continue;
-        }
+      // Script type doesn't give any info, better skip it
+      const currChar = this.state.sliceDoc(startPos, startPos+1);
+      let node = tree.resolve(startPos);
+      if(node.type.name == 'Script' || (currChar == '\n')) {
+        startPos -= 1;
+        continue;
+      }
 
-        // Script type doesn't give any info, better skip it.
-        const currChar = this.state.sliceDoc(startPos, startPos+1);
-        let node = tree.resolve(startPos);
-        if(node.type.name == 'Script' || (currChar == '\n')) {
+      // Skip the comments
+      if(node.type.name == 'LineComment' || node.type.name == 'BlockComment') {
+        startPos = node.from - 1;
+        validTextFound = true;
+        continue;
+      }
+
+      // Sometimes, node type is child of statement
+      while(node.type.name != 'Statement' && node.parent) {
+        node = node.parent;
+      }
+
+      // We already had found valid text
+      if(validTextFound) {
+        if(statementStartPos >= 0 && statementStartPos < startPos) {
           startPos -= 1;
           continue;
         }
+        startPos = node.to;
+        break;
+      }
 
-        // Skip the comments
-        if(node.type.name == 'LineComment' || node.type.name == 'BlockComment') {
-          startPos = node.from - 1;
-          // comments are valid text
-          validTextFound = true;
-          continue;
-        }
+      // Statement found for the first time
+      if(node.type.name == 'Statement') {
+        statementStartPos = node.from;
+        maxEndPos = node.to;
 
-        // sometimes, node type is child of statement.
-        while(node.type.name != 'Statement' && node.parent) {
-          node = node.parent;
+        if(node.from >= currLine.from) {
+          startPos = node.from;
         }
+      }
 
-        // We already had found valid text
-        if(validTextFound) {
-          // continue till it reaches start so we can check for empty lines, etc.
-          if(statementStartPos >= 0 && statementStartPos < startPos) {
-            startPos -= 1;
-            continue;
-          }
-          // don't go beyond this
-          startPos = node.to;
-          break;
-        }
+      validTextFound = true;
+      startPos -= 1;
+    }
 
-        // statement found for the first time
-        if(node.type.name == 'Statement') {
-          statementStartPos = node.from;
-          maxEndPos = node.to;
+    // Move forward from start position
+    let endPos = startPos + 1;
+    maxEndPos = maxEndPos == -1 ? this.state.doc.length : maxEndPos;
+    while(endPos < maxEndPos) {
+      const currLine = this.state.doc.lineAt(endPos);
 
-          // if the statement is on the same line, jump to stmt start
-          if(node.from >= currLine.from) {
-            startPos = node.from;
-          }
-        }
+      // If empty line in between then that's it
+      if(currLine.text.trim() == '' && stopAtBlankLine) {
+        break;
+      }
 
-        validTextFound = true;
-        startPos -= 1;
+      let node = tree.resolve(endPos);
+      // Skip the comments
+      if(node.type.name == 'LineComment' || node.type.name == 'BlockComment') {
+        endPos = node.to + 1;
+        continue;
       }
 
-      // move forward from start position
-      let endPos = startPos+1;
-      maxEndPos = maxEndPos == -1 ? this.state.doc.length : maxEndPos;
-      while(endPos < maxEndPos) {
-        const currLine = this.state.doc.lineAt(endPos);
+      // Skip any other types
+      if(node.type.name != 'Statement') {
+        endPos += 1;
+        continue;
+      }
 
-        // If empty line in between then that's it
-        if(currLine.text.trim() == '') {
-          break;
-        }
+      // Can't go beyond a statement
+      if(node.type.name == 'Statement') {
+        maxEndPos = node.to;
+      }
 
-        let node = tree.resolve(endPos);
-        // Skip the comments
-        if(node.type.name == 'LineComment' || node.type.name == 'BlockComment') {
-          endPos = node.to + 1;
-          continue;
-        }
+      if(currLine.to < maxEndPos) {
+        endPos = currLine.to + 1;
+      } else {
+        endPos += 1;
+      }
+    }
 
-        // Skip any other types
-        if(node.type.name != 'Statement') {
-          endPos += 1;
-          continue;
-        }
+    // Make sure start and end are valid values
+    if(startPos < 0) startPos = 0;
+    if(endPos > this.state.doc.length) endPos = this.state.doc.length;
 
-        // can't go beyond a statement
-        if(node.type.name == 'Statement') {
-          maxEndPos = node.to;
-        }
+    return { startPos, endPos };
+  }
 
-        if(currLine.to < maxEndPos) {
-          endPos = currLine.to + 1;
-        } else {
-          endPos +=1;
-        }
+  /* Function to extract query based on position passed */
+  getQueryAt(currPos) {
+    try {
+      if(typeof currPos == 'undefined') {
+        currPos = this.state.selection.main.head;
       }
+      const tree = syntaxTree(this.state);
 
-      // make sure start and end are valid values;
-      if(startPos < 0) startPos = 0;
-      if(endPos > this.state.doc.length) endPos = this.state.doc.length;
+      // First pass: find boundaries with blank lines as boundaries
+      let { startPos, endPos } = this._findQueryBoundaries(currPos, tree, true);
+
+      // Check if the result is a complete query
+      if (!this.isCompleteQuery(startPos, endPos)) {
+        // Query is incomplete, try expanding by ignoring blank lines
+        const expanded = this._findQueryBoundaries(currPos, tree, false);
+        startPos = expanded.startPos;
+        endPos = expanded.endPos;
+      }
 
       return {
         value: this.state.sliceDoc(startPos, endPos).trim(),
diff --git a/web/regression/javascript/components/CodeMirrorCustomEditor.spec.js b/web/regression/javascript/components/CodeMirrorCustomEditor.spec.js
index e3c1c0d58b9..ca473d79432 100755
--- a/web/regression/javascript/components/CodeMirrorCustomEditor.spec.js
+++ b/web/regression/javascript/components/CodeMirrorCustomEditor.spec.js
@@ -115,4 +115,34 @@ describe('CodeMirrorCustomEditorView', ()=>{
     expect(editor.getQueryAt(29)).toEqual({'value': 'select * from public.actor;', 'from': 0, 'to': 27});
   });
 
+  it('cursor on WHERE clause with blank lines between SELECT and FROM and WHERE',()=>{
+    // Query with blank lines between clauses: SELECT *\n\nFROM pg_class\n\nWHERE id = 1;
+    cmRerender({value: 'SELECT *\n\nFROM pg_class\n\nWHERE id = 1;'});
+    // Cursor at WHERE clause (position 25), should return full query
+    expect(editor.getQueryAt(25)).toEqual({'value': 'SELECT *\n\nFROM pg_class\n\nWHERE id = 1;', 'from': 0, 'to': 38});
+  });
+
+  it('cursor on FROM clause with blank lines in query',()=>{
+    // Query with blank lines between clauses
+    cmRerender({value: 'SELECT *\n\nFROM pg_class\n\nWHERE id = 1;'});
+    // Cursor at FROM clause (position 10), should return full query
+    expect(editor.getQueryAt(10)).toEqual({'value': 'SELECT *\n\nFROM pg_class\n\nWHERE id = 1;', 'from': 0, 'to': 38});
+  });
+
+  it('cursor on condition line with WHERE on separate line',()=>{
+    // Query: select *\n\nfrom pg_attribute\n\nWHERE\n\nattrelid > 3000;
+    const query = 'select *\n\nfrom pg_attribute\n\nWHERE\n\nattrelid > 3000;';
+    cmRerender({value: query});
+    // Cursor at 'attrelid' condition (position 38), should return full query
+    expect(editor.getQueryAt(38)).toEqual({'value': query, 'from': 0, 'to': query.length});
+  });
+
+  it('cursor on WHERE keyword with blank lines around it',()=>{
+    // Query: select *\n\nfrom pg_attribute\n\nWHERE\n\nattrelid > 3000;
+    const query = 'select *\n\nfrom pg_attribute\n\nWHERE\n\nattrelid > 3000;';
+    cmRerender({value: query});
+    // Cursor at WHERE keyword (position 30), should return full query
+    expect(editor.getQueryAt(30)).toEqual({'value': query, 'from': 0, 'to': query.length});
+  });
+
 });